Yeah but at one point the future was WPF, then it was Silverlight, then it was Javascript...
Sure, they keep inventing new GUI toolkits for little reason, but unlike Google, the old ones can still be relied on.
Not really, a bunch of apps from the WinRT era are very broken under Windows 10. It’s disappointing given how much from the early 90s still works, but code from 2013 is now totally broken.
Silverlight is where things have started to go downwards wrt long-term stability. But Win32, MFC, and WinForms are still very much alive and well. I mean, WinForms even got .NET Core treatment and high/dynamic DPI support.
Yes. UWP already mostly uses WinUI 2.0 I think. 3.0 will expand the minds of applications that can make use of the component library and provide a way to gradually incorporate newer controls into older technologies (WinForms, WPF etc).