Every word in this sentence is the opposite of my experience and understanding. RN feels like a half maintained backwater compared to react for web. Lots of out of date docs, awful debugging experience, inconsistencies between ios and android, fidgety and flakey all the time. And it has all felt like that for a while. So I would beg to differ with "maturing" and would definitely call bs on anyone characterizing it as "mature".

About Flutter, I've never personally used it but last I read its marketshare was continuing to grow fast as RN's plateaued. I love TS and the react ecosystem but RN itself is so crappy that I'm considering dart (did I just say that???). I think architecturally Flutter made the right call to just implement their own components on skia to get perfect consistency across platforms and totally control their own destiny. Sadly they also chose a weird shitty language.

I don't think Flutter is dying at all. I see it's adoption growing day by day. Also Google Trends indicates that Flutter has almost twice the search share compared to RN: https://trends.google.com/trends/explore?geo=IN&q=%2Fg%2F11h...