I was pessimistic about flutter 4 years ago but rechecked it recently (learning right now) and IMO it's really good user/developer proposition these days. They resolved most of issues on mobile devices and desktops - only web version still off but once wasmGC is ready (hopefully this year) probably things will improve.

Best way for developer elevator pitch just download few flutter apps and see how you like the experience:

1. wonderous - https://flutter.gskinner.com/wonderous/

2. flutterflow (low code + gui editor for flutter) - https://flutterflow.io/

3. appflowy (notion alternative) - https://appflowy.io/

4. flutter gallery (official flutter kitchen sink) -

Android (Google Play Store) - https://play.google.com/store/apps/details?id=io.flutter.dem...

web (gallery.flutter.dev) - https://gallery.flutter.dev/

macOS (.zip) - https://github.com/flutter/gallery/releases/latest

5. official material 3.0 demo - https://flutter.github.io/samples/web/material_3_demo/#/