[forgotAgain]

So then UWP is basically dead for 99+% of it's use cases.

For mobile: use Xamarin.

For desktop: use win32/.net so you can support pre August 2016 versions of Windows.

For Xbox and ARM where you also need support for desktop and mobile devices: use UWP.

[WorldMaker]

There is no "Xamarin for Windows" there is only UWP. Xamarin spreads in the other direction giving Android and iOS a more UWP-like .NET development stack.

For Desktop, probably still a better idea for new development to be in UWP directly instead of converting a Win32 app.

This isn't the "death" of UWP, this is a stopgap bridge to take the long legacy of old Windows apps and give them a new life in the UWP era, including making it much easier to migrate out of classic Win32/.NET for newer UWP APIs, one screen at a time instead of porting the whole thing at once.