diff --git a/.github/workflows/e2e-manual.yml b/.github/workflows/e2e-manual.yml
index 335715ec..d3384a35 100644
--- a/.github/workflows/e2e-manual.yml
+++ b/.github/workflows/e2e-manual.yml
@@ -22,6 +22,11 @@ on:
         required: true
         default: false
         type: boolean
+      exclude_timing_sensitive:
+        description: Exclude timing-sensitive optional scenarios (ON_NEXT_RESUME/ON_NEXT_SUSPEND)
+        required: false
+        default: true
+        type: boolean
 
 jobs:
   e2e-ios:
@@ -85,11 +90,17 @@ jobs:
         env:
           E2E_RETRY_COUNT: "3"
           E2E_RETRY_DELAY_SEC: "30"
+          E2E_EXCLUDE_TIMING_SENSITIVE: ${{ inputs.exclude_timing_sensitive }}
         run: |
+          TIMING_SENSITIVE_ARG=""
+          if [ "$E2E_EXCLUDE_TIMING_SENSITIVE" = "true" ]; then
+            TIMING_SENSITIVE_ARG="--exclude-timing-sensitive"
+          fi
+
           if [ "${{ inputs.expo }}" = "true" ]; then
-            npm run e2e -- --app "${{ inputs.app }}" --platform ios --simulator "${{ steps.boot-simulator.outputs.simulator }}" --framework expo --retry-count "$E2E_RETRY_COUNT" --retry-delay-sec "$E2E_RETRY_DELAY_SEC"
+            npm run e2e -- --app "${{ inputs.app }}" --platform ios --simulator "${{ steps.boot-simulator.outputs.simulator }}" --framework expo --retry-count "$E2E_RETRY_COUNT" --retry-delay-sec "$E2E_RETRY_DELAY_SEC" $TIMING_SENSITIVE_ARG
           else
-            npm run e2e -- --app "${{ inputs.app }}" --platform ios --simulator "${{ steps.boot-simulator.outputs.simulator }}" --retry-count "$E2E_RETRY_COUNT" --retry-delay-sec "$E2E_RETRY_DELAY_SEC"
+            npm run e2e -- --app "${{ inputs.app }}" --platform ios --simulator "${{ steps.boot-simulator.outputs.simulator }}" --retry-count "$E2E_RETRY_COUNT" --retry-delay-sec "$E2E_RETRY_DELAY_SEC" $TIMING_SENSITIVE_ARG
           fi
 
   e2e-android:
@@ -150,4 +161,4 @@ jobs:
           arch: x86_64
           profile: pixel_7
           emulator-boot-timeout: 900
-          script: if [ "${{ inputs.expo }}" = "true" ]; then npm run e2e -- --app "${{ inputs.app }}" --platform android --framework expo --retry-count "$E2E_RETRY_COUNT" --retry-delay-sec "$E2E_RETRY_DELAY_SEC"; else npm run e2e -- --app "${{ inputs.app }}" --platform android --retry-count "$E2E_RETRY_COUNT" --retry-delay-sec "$E2E_RETRY_DELAY_SEC"; fi
+          script: TIMING_SENSITIVE_ARG=$([ "${{ inputs.exclude_timing_sensitive }}" = "true" ] && echo "--exclude-timing-sensitive" || echo ""); if [ "${{ inputs.expo }}" = "true" ]; then npm run e2e -- --app "${{ inputs.app }}" --platform android --framework expo --retry-count "$E2E_RETRY_COUNT" --retry-delay-sec "$E2E_RETRY_DELAY_SEC" $TIMING_SENSITIVE_ARG; else npm run e2e -- --app "${{ inputs.app }}" --platform android --retry-count "$E2E_RETRY_COUNT" --retry-delay-sec "$E2E_RETRY_DELAY_SEC" $TIMING_SENSITIVE_ARG; fi
diff --git a/.github/workflows/e2e-matrix.yml b/.github/workflows/e2e-matrix.yml
index b82c554d..e261b0a6 100644
--- a/.github/workflows/e2e-matrix.yml
+++ b/.github/workflows/e2e-matrix.yml
@@ -13,10 +13,10 @@ on:
         required: false
         default: true
         type: boolean
-      include_timing_sensitive:
-        description: Include timing-sensitive optional scenarios (ON_NEXT_RESUME/ON_NEXT_SUSPEND)
+      exclude_timing_sensitive:
+        description: Exclude timing-sensitive optional scenarios (ON_NEXT_RESUME/ON_NEXT_SUSPEND)
         required: false
-        default: false
+        default: true
         type: boolean
 
 jobs:
@@ -146,11 +146,11 @@ jobs:
           MAESTRO_DRIVER_STARTUP_TIMEOUT: "300000"
           E2E_RETRY_COUNT: "3"
           E2E_RETRY_DELAY_SEC: "30"
-          E2E_INCLUDE_TIMING_SENSITIVE: ${{ inputs.include_timing_sensitive }}
+          E2E_EXCLUDE_TIMING_SENSITIVE: ${{ inputs.exclude_timing_sensitive }}
         run: |
           TIMING_SENSITIVE_ARG=""
-          if [ "$E2E_INCLUDE_TIMING_SENSITIVE" = "true" ]; then
-            TIMING_SENSITIVE_ARG="--include-timing-sensitive"
+          if [ "$E2E_EXCLUDE_TIMING_SENSITIVE" = "true" ]; then
+            TIMING_SENSITIVE_ARG="--exclude-timing-sensitive"
           fi
 
           if [ "${{ startsWith(matrix.app, 'Expo') }}" = "true" ]; then
@@ -233,4 +233,4 @@ jobs:
           arch: x86_64
           profile: pixel_7
           emulator-boot-timeout: 900
-          script: TIMING_SENSITIVE_ARG=$([ "${{ inputs.include_timing_sensitive }}" = "true" ] && echo "--include-timing-sensitive" || echo ""); if [ "${{ startsWith(matrix.app, 'Expo') }}" = "true" ]; then npm run e2e -- --app "${{ matrix.app }}" --platform android --framework expo --retry-count "$E2E_RETRY_COUNT" --retry-delay-sec "$E2E_RETRY_DELAY_SEC" $TIMING_SENSITIVE_ARG; else npm run e2e -- --app "${{ matrix.app }}" --platform android --retry-count "$E2E_RETRY_COUNT" --retry-delay-sec "$E2E_RETRY_DELAY_SEC" $TIMING_SENSITIVE_ARG; fi
+          script: TIMING_SENSITIVE_ARG=$([ "${{ inputs.exclude_timing_sensitive }}" = "true" ] && echo "--exclude-timing-sensitive" || echo ""); if [ "${{ startsWith(matrix.app, 'Expo') }}" = "true" ]; then npm run e2e -- --app "${{ matrix.app }}" --platform android --framework expo --retry-count "$E2E_RETRY_COUNT" --retry-delay-sec "$E2E_RETRY_DELAY_SEC" $TIMING_SENSITIVE_ARG; else npm run e2e -- --app "${{ matrix.app }}" --platform android --retry-count "$E2E_RETRY_COUNT" --retry-delay-sec "$E2E_RETRY_DELAY_SEC" $TIMING_SENSITIVE_ARG; fi
diff --git a/e2e/README.ko.md b/e2e/README.ko.md
index b0753a32..438d38fd 100644
--- a/e2e/README.ko.md
+++ b/e2e/README.ko.md
@@ -40,7 +40,7 @@ npm run e2e -- --app Expo55Beta --framework expo --platform ios --maestro-only
 | `--framework <type>` | 아니오 | Expo 예제 앱인 경우 `expo` 지정 |
 | `--simulator <name>` | 아니오 | iOS 시뮬레이터 이름 (부팅된 시뮬레이터 자동 감지, 기본값 "iPhone 16") |
 | `--maestro-only` | 아니오 | 빌드 단계 생략, 테스트 플로우만 실행 |
-| `--include-timing-sensitive` | 아니오 | 타이밍 민감 optional 시나리오(`03`, `04`) 추가 실행. 기본값: 비활성 |
+| `--exclude-timing-sensitive` | 아니오 | 타이밍 민감 optional 시나리오(`03`, `04`)를 제외합니다. 기본값: 비활성, 즉 로컬 실행에는 기본 포함 |
 
 ## 실행 과정
 
@@ -75,8 +75,8 @@ npm run e2e -- --app Expo55Beta --framework expo --platform ios --maestro-only
 13. **optional 업데이트 플로우 실행** — 아래 조건에서 업데이트가 적용되는지 확인합니다.
    - `01-optional-update-on-relaunch` — 앱을 종료 후 재실행할 때
    - `02-optional-update-on-restart-button` — 앱 내 "Restart app" 버튼을 누를 때
-   - `03-optional-update-on-resume-after-20s` — 앱이 백그라운드에 20초 이상 머문 뒤 포그라운드로 돌아올 때 `ON_NEXT_RESUME`으로 업데이트가 적용되는지 확인합니다. `--include-timing-sensitive` 옵션 사용 시에만 실행
-   - `04-optional-update-on-suspend-after-20s` — 앱이 백그라운드에 20초 이상 머무는 동안 `ON_NEXT_SUSPEND`로 업데이트가 적용되고, 다음 포그라운드 진입 시 반영된 번들이 보이는지 확인합니다. `--include-timing-sensitive` 옵션 사용 시에만 실행
+   - `03-optional-update-on-resume-after-20s` — 앱이 백그라운드에 20초 이상 머문 뒤 포그라운드로 돌아올 때 `ON_NEXT_RESUME`으로 업데이트가 적용되는지 확인합니다. `--exclude-timing-sensitive`를 주지 않으면 실행됩니다.
+   - `04-optional-update-on-suspend-after-20s` — 앱이 백그라운드에 20초 이상 머무는 동안 `ON_NEXT_SUSPEND`로 업데이트가 적용되고, 다음 포그라운드 진입 시 반영된 번들이 보이는지 확인합니다. `--exclude-timing-sensitive`를 주지 않으면 실행됩니다.
 
 ## 아키텍처
 
diff --git a/e2e/README.md b/e2e/README.md
index b765f753..066c47f2 100644
--- a/e2e/README.md
+++ b/e2e/README.md
@@ -40,7 +40,7 @@ npm run e2e -- --app Expo55Beta --framework expo --platform ios --maestro-only
 | `--framework <type>` | No | Use `expo` for Expo example apps |
 | `--simulator <name>` | No | iOS simulator name (auto-detects booted simulator, defaults to "iPhone 16") |
 | `--maestro-only` | No | Skip build step, only run test flows |
-| `--include-timing-sensitive` | No | Also run timing-sensitive optional scenarios (`03`, `04`). Default: off |
+| `--exclude-timing-sensitive` | No | Skip timing-sensitive optional scenarios (`03`, `04`). Default: off, so local runs include them |
 
 ## What It Does
 
@@ -75,8 +75,8 @@ The test runner (`e2e/run.ts`) executes these phases in order:
 13. **Run optional update flows** — Verifies optional updates are applied when:
    - `01-optional-update-on-relaunch` — The app is killed and relaunched.
    - `02-optional-update-on-restart-button` — The in-app "Restart app" button is pressed.
-   - `03-optional-update-on-resume-after-20s` — Verifies `ON_NEXT_RESUME` applies the update when the app returns to foreground after staying in background for at least 20 seconds. Runs only with `--include-timing-sensitive`.
-   - `04-optional-update-on-suspend-after-20s` — Verifies `ON_NEXT_SUSPEND` applies the update while the app stays in background for at least 20 seconds, so the updated bundle is visible on the next foreground. Runs only with `--include-timing-sensitive`.
+   - `03-optional-update-on-resume-after-20s` — Verifies `ON_NEXT_RESUME` applies the update when the app returns to foreground after staying in background for at least 20 seconds. Runs unless `--exclude-timing-sensitive` is passed.
+   - `04-optional-update-on-suspend-after-20s` — Verifies `ON_NEXT_SUSPEND` applies the update while the app stays in background for at least 20 seconds, so the updated bundle is visible on the next foreground. Runs unless `--exclude-timing-sensitive` is passed.
 
 ## Architecture
 
diff --git a/e2e/run.ts b/e2e/run.ts
index eb130d2e..7efe9eb5 100644
--- a/e2e/run.ts
+++ b/e2e/run.ts
@@ -14,7 +14,7 @@ interface CliOptions {
   framework?: "expo";
   simulator?: string;
   maestroOnly?: boolean;
-  includeTimingSensitive?: boolean;
+  excludeTimingSensitive?: boolean;
   retryCount: number;
   retryDelaySec: number;
 }
@@ -50,8 +50,8 @@ const program = new Command()
   .option("--simulator <name>", "iOS simulator name (default: booted)")
   .option("--maestro-only", "Skip build, only run test flows", false)
   .option(
-    "--include-timing-sensitive",
-    "Include timing-sensitive optional install mode scenarios (ON_NEXT_RESUME/ON_NEXT_SUSPEND)",
+    "--exclude-timing-sensitive",
+    "Exclude timing-sensitive optional install mode scenarios (ON_NEXT_RESUME/ON_NEXT_SUSPEND)",
     false,
   )
   .option(
@@ -227,7 +227,7 @@ async function main() {
       },
     ];
 
-    if (options.includeTimingSensitive) {
+    if (!options.excludeTimingSensitive) {
       optionalUpdateScenarios.push(
         {
           name: "apply on resume after 20 seconds",
@@ -240,8 +240,10 @@ async function main() {
           flowPath: path.resolve(__dirname, "flows-optional/04-optional-update-on-suspend-after-20s.yaml"),
         },
       );
-    } else {
-      console.log("\n=== [phase 4] skipping timing-sensitive scenarios (pass --include-timing-sensitive to enable) ===");
+    }
+
+    if (options.excludeTimingSensitive) {
+      console.log("\n=== [phase 4] skipping timing-sensitive scenarios (omit --exclude-timing-sensitive to include them) ===");
     }
 
     for (const scenario of optionalUpdateScenarios) {