The documentation seems inconsistency about the content of the MainActivity class of a app created with android embedding v2 enabled (default).

1. https://github.com/flutter/flutter/wiki/Upgrading-pre-1.12-Android-projects say to replace the onCreate method with a configureFlutterEngine method
2. https://flutter.dev/docs/development/packages-and-plugins/plugin-api-migration say to keep the class empty because plugins are registered automatically

The default template when creating app with v2 enabled (the default) is to have the configureFlutterEngine method present. That seems to generate this kind of issues : firebase/flutterfire#1669 because plugin are registered twice. Keep class empty seems to fix that
Is configureFlutterEngine useful ?