I think you might have meant UWP.
replyWPF is still around and have been spruced up as of late.
UWP was the DOA Windows 8/8.1/10 app format that was super restrictive, strange to develop for, and non-portable. It's basically MS's equivalent of SwiftUI.
WPF was abandoned at birth, it went years without any attention and then was superseded.
replyApple has at least been consistent on UI frameworks.
Sort of superseded. In practice WPF is still very often the best option in the complete mess that is window GUIs
replyYeah, I like WPF and I still use it for my own apps. In fact, my own software is the only thing keeping me on Windows now. I really should take a look at Avalonia and port my stuff over to Linux.
replyWPF was stamped out by lack of dogfooding = inability to inspire confidence, and then Microsoft spazzing out with that clusterfuck that was the Windows 8 "Metro" bullshit.
replyBack when I wanted WPF to succeed, Microsoft was barely using it in any of their own apps.
Apple has used SwiftUI in their OS more than MS/Windows did, and there's quite a few apps on the App Store that -seem- to be made with SwiftUI.