I don't see Flutter as a replacement for Android development.
It might be good for quick "business" apps, these are apps with basic forms or catalogues. But if you need to do anything more technical and better system integration then this will become a lot harder and you might even need to use 3rd party plugins or develop your own for things that are supported natively in Java/Kotlin.
For me a good indication that Flutter isn't going to be the next major framework/tool for Android development is that Google itself is not promoting it that much. They are promoting Kotlin a lot more and have more documentation, examples and also better integration in Android Studio.
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