Interesting choice to choose Flutter ... will be interesting to see if that was the right choice in the long term. I get the impression Google has more people working on Kotlin/Compose Multiplatform.
I don't know much about Kotlin Multiplatform or Compose Multiplatform. But from what I've seen, the Android group in general doesn't live up to that high standard as an open-source project. You can report bugs and might get a reply, but can't really participate in the discussion; the public bug often gets linked to a bunch of internal bugs you can't see, and the code reviews for any fix happen in private.
(I lead the Zulip mobile team, so the decision to use Flutter was primarily mine.)
everything works, all the necessary ui widgets are there. no more tinkering around with css or new css flavor of the month. layout is easy peasy.
performance is great. and best, iteration speed is awesome.