People are underestimating how much money valve has put into proton, Mesa and Linux development over the years to make the steam deck work. they had 100+ developers on payroll for years to do that.
that's really good news. I hope others will follow suit. there's a couple of games that I miss on steamos because of Anti-Cheat that only works on windows.
top. you can see part of the handrail on the top left of the picture