The thing making this easy in web pages is the _tooling_ though.
The reason this is harder in Android than in web environments is that web tooling is just _very_ mature.
Theoretically nothing is preventing you from exposing this functionality in Android/iOS/flutter/react-native/ whatever.
In practice hot-reloading is a lot more valuable and useful since you edit from your IDE (and not the devtools) and all modern UI platforms (flutter/android jetpack/SwiftUI) support it from what I recall.
With Android/iOS/flutter/react-native there's an expectation that developers are a separate community from the rest of the users, one that might not even use the apps they right daily. This contrasts heavily to the web where the users and developers are often using the same tools.
