Comment by okanat

I think the success of Proton and Wine in games clouds the vision of Linux community. The contributors did great work on them. However the gaming API of Windows is a very limited slice of the vast API.

Games are quite standalone programs they don't depend deeply integrated Win32 stuff. They don't even use standard UI stuff from Win32. With Vulkan, porting DirectX became very viable and that was the grunt work. There are no DCOM servers or OLE stuff in games which is where Windows API actually becomes huge and sometimes nastier. Business apps however deeply depend on those.