Cppwinrt is in maintenance mode[1]. Cppwin32 is abandoned (with windows.h as the official alternative). It is now possible to deploy WinUI 3 apps as single files in C#[2] but not in C++. From experience, the entire C++ side of WinUI 3 documentation is underbaked to the extent that the easiest approach is to read the C# documentation and attempt to guess the cppwinrt equivalent (as docs for cppwinrt are not really... there).

I don’t know if they’ve really abandoned C++ entirely—the compiler team certainly hasn’t, that’s true. But the above doesn’t feel like first-class support.

[1] https://github.com/microsoft/cppwinrt/issues/1289#issuecomme...

[2] https://learn.microsoft.com/en-us/dotnet/core/deploying/sing...

WinUI3 itself feels kind of abandoned. Heck, everything except desktop OS (which changes we neither need nor want) and cloud (where everyone has gone) feels a bit neglected.

C#/dotnet continues nicely, but the team is surprisingly small if you look closely.

Microsoft doesn't commit to UI frameworks in any language. By contrast, DirectX 11 and 12 (and Direct2D) are C++-native and have become core modules within NT. I don't think MS has abandoned C++, but the use case for C++ has shrunk considerably since the 1990s