YSK that Steam counts Macs running Windows games through Game Porting ToolKit as Windows machines.
Game developers will do the bare minimum. IMO they won’t bother with a native Linux build if their games run good enough through Proton, at least for the time being.
Linux needs to get more market share, like way more, to move things unfortunately. I know the feeling very well. It was the case on Mac when Bootcamp was still a thing, even though macOS had great OpenGL support.