If I was still doing Windows development, I would likely still be using Winforms to this day - you can't beat it from a purely functional prototyping tool even if it doesn't produce the most aesthetic GUIs ever.
It's a great successor to IMHO one of the other all time best RAD environments, Visual Basic. (Though I've head Pascal had some really nice out-of-the-box tools for GUI work)
Delphi has an amazing RAD environment. For building small, self-contained desktop apps (with cross-platform support!) it beats any other modern offering... if you can get past the ecosystem. The language and ecosystem very much show their age.
Anyway, I think this generation is missing out on the experience of building in a real RAD environment. I'm more on the backend, but from what I see the pinnacle is fast hot reload, which pales in comparison to what could be.
They didn’t need to because they already had WinForms as a baseline experience for Windows UIs.