I've thought about the kotlin/flutter integration quite a bit. Flutter is risky right now because although you can technically use it inside of a native android/ios project, its not simple to do so in practice. If you have completely separate android and ios code, you need to integrate with both of these platforms and the different ways those teams have constructed their architectures. That's on top of the fact that last time I tried to put some flutter into an existing app as a test, it was far from smooth. Just mechanically speaking, it wasn't like you just right click and say "add flutter". We ran into a lot of issues. Anyway...