What's the sense of Flutter side configuration if native one is still required?

[PawlikMichal25]

I just followed the official way of setting up Flutter project - initialization in Dart code, but compilation of my project failed with:

* What went wrong:
Execution failed for task ':app:processDevDebugGoogleServices'.
> File google-services.json is missing. The Google Services Plugin cannot function without it. 

I can see that in Crashlytics example you also have google-services.json https://github.com/firebase/flutterfire/blob/master/packages/firebase_crashlytics/firebase_crashlytics/example/android/app/google-services.json in addition to https://github.com/firebase/flutterfire/blob/master/packages/firebase_crashlytics/firebase_crashlytics/example/lib/firebase_options.dart

but if we still need to configure Firebase on native side, then what's the point of duplicating it on Flutter side?