All software has limitations, that's why we keep writing more software.

Kivy is great, and the contributors are friendlier than most. I particularly like it for Android, but it's definitely way up there in terms of "easy reliable multiplatform python framework".

It also gives you a ton of options for how you want to use it, more than one way to skin a cat philosophy.

I tried using Kivy some years ago and also found it pretty painful. Flet I've been using for a while now and find it a joy by comparison, and it's actively developed, with a release every couple months or so. With the stability of v1.0 I expect that to slow a bit though, as I'd say at least core Flet is feature complete.