But the gaming software market is very heavily biased towards delivering for Windows on Intel. That said, I’m not a gamer so what do I know?
And pracically _nobody_ does native Linux games, they're all just running Windows games through Proton, and faster. So fast actually that Proton is Microsoft's performance target :D
But yeah, Proton is so good now that I don't think there's much impetus to port. Test on Deck/Steam Machine/Proton, sure, but not so much port. Steam Play also handles runtime container stuff for native Linux games so that can be pretty good and stable itself, but I've definitely had situations where switching over to the Windows version via Proton is a better result than the native Linux one.