I think the disconnect in the debate here is that many Linux users would happily tweak a little bit or give up 5-10fps in order to run Linux.

So when they say “no problem” it could mean that it runs at 100% the windows perf, or 90%. (Or even above in some cases, although more rarely). They wouldn’t know and most wouldn’t care. It runs fast enough because they see other positives with using Linux (freedom, cost, control, integrity, whatever).

But for users who really dislike Linux the problem is much more nuanced. I’m no big windows fan either - but I’ll pick the platform with the 10% higher FPS any day. With a 2080/3080/3090 one pays pretty good money for those last 10% perf after all.

I was going to give a nod towards what you're saying in my post but I decided against it. I was a competitive FPS player in the late 90s and early 2000s. Quake 2, Quake 3, and Rocket Arena 3. If I was still a competitive FPS player, I would remain on Windows and it wouldn't even be a question.

edit/ Also, by a stroke of luck, my 2080 is a developer card and I got it for free from a colleague with ties to NVIDIA. If I was still on a GTX 980, I may be singing an entirely different song right now.