I think Flet looks super interesting as an app framework that combines Flutter with Python. I'm not in general convinced that Flutter solves everything, or that there is any "one size fits all" framework. However this is a really compelling framework for some apps!
Interestingly it looks like, for the web app version, they have a permanent web socket to Python on the server, a bit like Phoenix Liveview. I wander if that could be removed by using PyScript to run the Python layer in browser.
I wander if the desktop version (and planed mobile apps) is the same, with a web-socket back to a Python server.
(Just noticed my typo in the title, it should be Flet, could a mod change it? It well passed the edit window)