Earlier quoted context omitted.
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.
I know pretty well how Proton works.