Unfortunely it is built on top of WinUI 3, with all the warts it entails.
Mostly because since they killed C++/CX, there is no UI tooling story for doing XAML C++, without having to deal with IDL COM like mess in Visual Studio, only worse in WinRT case.
> Unfortunely it is built on top of WinUI 3, with all the warts it entails.
I'm not sure that's relevant. The whole point of React Native is that you do not touch the underlying framework. Instead of churning out XAML, you just write React and let the framework bother with how the GUI is implemented under the hood.