The Windows app development situation has become such a mess even Microsoft devs want to use Electron style containment for everything. That is the result.
Edit to add: I'm sure other people can chip in with more, but what I was told was the .net teams and Windows teams pulled in completely different directions. WPF/XAML was really widely liked by many developers for quite a while, then they put it on ice for no apparent reason (supposedly because the core Windows team had better ideas), and their on/off stance on this ever since has just driven everyone away.
If in doubt, try making sense of the "Platforms" section https://learn.microsoft.com/en-us/windows/apps/desktop/ and wondering if you would bet on those things being supported in 18 months time.
Edit to add: I'm sure other people can chip in with more, but what I was told was the .net teams and Windows teams pulled in completely different directions. WPF/XAML was really widely liked by many developers for quite a while, then they put it on ice for no apparent reason (supposedly because the core Windows team had better ideas), and their on/off stance on this ever since has just driven everyone away.