Are there hardcore gamers there or is it mostly for coders?
Steam deck has grown it a fair bit. Excluding anticheat, most games can be made to work with the assistance of proton See protonDB for specific games, but it’s a definite thing.
BattleEye and EAC are supported, IF the developers enable it for their games.
I can play whatever I want on Linux, there’s so many options that make it work like Lutris, Bottles, Heroic Games Launcher and Steam of course. There are some exceptions though, some games don’t work, but that’s often a deliberate choice of the studios. Looking at you, Bungie.
Through Steam and Proton, I’m able to play most of the games I’m interested in: Mass Effect, Last of Us, Jedi Fallen Order & Survivor. Steam Deck is built on Linux too.
I know Steam (Valve) have metrics on it that probably give a good idea of how Linux fares in the PC market for gaming. Probably not entirely accurate but maybe accurate enough. I know it’s the best I’ve ever seen though.
I use Linux exclusively for gaming. Sometimes there’s a performance hit or weird bug, but mostly it runs very well, occasionally better than on Windows. I have quite often heard of windows players complaining about older games no longer running properly, and I’ve often had no problems with these on Linux, for example the original Dead Space.
However there are technologies which are still quite some ways off. Rtaytracing is improving but still a generation behind windows in terms of performance and support. HDR is barely supported anywhere. Variable refresh rate, is supported in some instances, but not universally, e.g. Gnome doesn’t support it yet for Wayland. I don’t know anything much about VR but would suspect it may not be very well supported yet either.
Valve has certainly given linux a boost with the SteamDeck and all the work they’ve funded to make it a viable gaming platform. I just hope they release SteamOS for all platforms soon, maybe we’ll see an uptick in PC pre-builds with SteamOS as an option instead of just Windows.