Having a desktop OS was a big thing 30 years ago, but now nobody cares anymore. Who interacts with their OS other than launching browsers or apps based on browsers? Not even most coders these days.
OSes are irrelevant these days and having basically libwindows.so these days only underlines that.
That is why GNU/Linux gaming is stuck on 2%, and needs to emulate Windows APIs.
Valve only stresses the relevance of Windows.
The Steam user survey isnt a representative number. An API isn't emulated, it's implemented, it's no more or less native than Windows itself.
In various benchmarks Proton is now outperforming Windows. There is no need for it anymore, outside some niche applications.
Studios don't care about native GNU/Linux, despite the games being shipped with Android/NDK, PlayStation POSIX environment, and the available APIs on Switch OS.
All of them much easier than porting from Windows/XBox, almost straight ports if coming from Android/NDK.