Everything else? Not so much, thanks to the monumental effort of Wine and Proton projects.
Lots of people don't play them. It's not like we don't have a choice.
CoD
Unsure of Blizzard games
Kernel-level spyware, and Wine/Proton are the non-starters?
I don't think you and the person you replied to will reach an agreement.
Just browse the Deck Verified page for example: https://www.steamdeck.com/en/verified & https://store.steampowered.com/greatondeck/
Forza Horizon 6 and Assassin's Creed Black Flag Resync'd are both listed, and both are very recent, major AAA game launches. With top-tier Linux compatibility.
It is staggering how different the situation is now as compared to just a couple years ago. Steam Deck (and associated investments by Valve) are damn near a revolution. It's a perfect storm of the incumbent turning to shit at the same time the underdog really got its act together.
If you or your friend group is really into a game that doesn't have Linux support yeah that's a bummer, especially when it's just because of the kernel level anticheat that's horrifying in its own right (triply so when it's for a PVE game, cough cough, helldivers 2, cough cough). But I don't think that's most people anymore. The more casual and indie game scene these days is huge, and of course single player games in general continue to be super popular.
Windows performance is also often worse than Wine/Proton's.
Nvidia is getting better I think they merged something recently that will help their vulkan pref match windows.