Honestly at this point who would seriously use any Microsoft UI framework? They've abandoned 100% of their previous UI frameworks unfinished when they get distracted by a new, shinier framework.
Why use a busted incomplete framework missing basic features when there's entire ecosystems of open source cross-platform frameworks being actively maintained and which actually have all the features you need?
Really this is just another UWP destined to be forgotten and scorned.
Forms and WPF are still reasonable options.
GDI32 only works as well as it ever did.
WPF uses DirectX 9, in any case it is good enough for many businesses use cases.
UWP never had feature parity with neither Forms nor WPF, so already it has a hard sell to businesses.
Microsoft marketing always cool about cool experiences and design, without the actual meat in features.
That is why there were API reboots between Windows 8, Windows 8.1 and Windows 10.
Then comes along Project Reunion, which is supposed to properly unify Win32 and UWP execution models, instead a few months in, they do yet another reboot, that to this day is a shadow of UWP features, endless bugs, and a team that everyone thought was also part of the layoffs, has they were radio silence for months.
GDI32 you say? At least it works.
Forms is still my go-to for quick one-off and disposable programs. But maily because it's simple and I have a big library of controls and extensions I've built over years to make Forms more complete.
I've also tried WPF, but it's missing very basic controls that I just don't feel like recreating.
Can you give examples? I've been looking for some open-source project ideas...
I dunno, they are still doing doing bug fixes to Winforms.