Sure — if the Flutter team didn’t add support for a new feature like this, then the app would maintain the old look. (Although in practice, we supported things like the iPhone X notch before the product even released.)

But more often, this works in Flutter’s favor. For example, we can bring updates to controls and UI design back to older platforms. You never again have to worry about whether a particular control is available across all your target phone ecosystem, or handling inconsistencies in the API between Android versions. This is hugely impactful in reducing the testing cycle for a Flutter app.

(Disclosure: I’m a PM on the Flutter team).