It's just too bad that Riot seems so inherently against supporting Linux. I still enjoy playing ARAMs for watching YouTube on the side and the occasional Val session. Obviously for Val I can just boot over but I do play league about daily.
Inb4 "just don't play league, it's bad anyway" yeah thanks, solid solution
The good thing about Valorant is you can just play (the better) Counter Strike instead and it doesn't try to install a rootkit. I guess for LoL you could play one of the alternatives too, but I don't know if any if them are good. They aren't my thing.
Weirdly enough, the only game I tried to play that didn't run was this random Indy game. Didn't even have fancy graphics, it was one step up from macromedia flash games
The AAA games I've played are fine on Linux. Baulders Gate, No Mans Sky, Fallout 76, Cyberpunk 2077, Crusader Kings III.
Fun fact, the Steam Deck discord has subcommunities designed for indie developers to group with Deck-owning volunteers; since not all indie devs own a Steam Deck, they can take a look at preview builds and inform the devs about any particular issues.
I've been experimenting recently and while most games run fine and VRR & HDR & Multimonitor somewhat work after some experimenting & tweaks I still have problems with a few games.
Some recent examples would be Noita stuttering and running in slow motion.
Getting anything from Ubisoft running (when it does run it runs great though).
And modding is very hit & miss.
If Dual Boot with windows (especially if running Bitlocker) wasn't such a PITA I would likely use Linux as my main OS.