Win32 is the style that Windows apps are supposed to be and what people expect in a Windows app. What are you talking about? In what way does the win32 look "not fly"?
I've tried to use WPF and it was just a major pain and felt like a mess. There is no impediment to "responsiveness".
Where did you get the idea winforms apps don't follow the system colors?
> Win32 is the style that Windows apps are supposed to be and what people expect in a Windows app.
Maybe in the Windows XP era. None of the built-in apps in Windows 10 look like Win32 apps, apart from legacy stuff that hasn't been ported yet and now looks sorely out of place.