It’s crazy. I’ve tried 100s of games on my Steamdeck, and I can’t think of a single example where one straight up failed to run. The most I’ve had to do is change the Proton version after a bit of Googling. Best of all, it doesn’t feel compromised - it feels like you’re running natively.
(I should say, I don’t do much online gaming, so I haven’t been thwarted by anti-cheat)
I realised the other day how ubiquitous Linux has become in my life. I have a Steamdeck, I run Mint on my laptop. I have numerous Pis around the house doing various things. For emulation I have a MiSTerFPGA and a Miyoo Mini Plus. My arcade cab runs RetroPie. It all just kind of sneaked up on me…