My gaming PC has a 9070 non-XT, runs Linux, and runs all but a small handful of games [0] just fine. I suspect you'll be happy with the switch.

I run games both new and old and one of my favorite guilty pleasures is looking at the Steam forum for a four, eight, or ten year old game that I've started playing because it has recently become popular again and reading the complaints from Windows users about how a driver update screwed up the game... whether because of glitchy or incorrect graphics or unavoidable crashes. Meanwhile, I'm cruising along on Proton with zero issues. :smug-face:

[0] ...that small handful includes those that go out of their way to be incompatible with Proton...