Honestly valve has done more for gaming on Linux than any other entity on earth, right now. I have been using Linux as my daily OS since 2007, or so. I started with Ubuntu 7.04 Feisty Fawn; back when I was sick of Windows XP and was looking for something new. I have been flipping through various different Linux distros for the last decade. But I generally just stick with Mint. It seems to just suit my needs best.
I had the first builds of Steam for Linux when it launched in 2013. The earliest versions of Steam on Linux only really supported Ubuntu officially. But it could be used on any distro. It was buggy and would crash. The Steam Linux Runtime in later updates really fixed that issue. I think the first proton betas launched in 2018. Originally, Proton was found in versions of Steam for MacOS, which lead people to believe that the Mac client would have a a windows compatibility layer embedded in it. But it ended up being the Linux Client.
Proton is a branch of DXVK, which is based on Wine. I believe Gabe Newell hired members of the DXVK team to make a custom version for Valve. Even the earliest versions of Steam Play on the Linux client showed a lot of promise. SteamOS became the back bone for the Steamdeck, and will be a crucial part of the latest attempt at a Steam machine.
Valve also invested a lot in the MESA driver stack as well, which really affects AMD cards in a big way. I would say pre-2019 or so, AMD cards had horrible driver support on Linux, while the closed source NVidia drivers were generally much more stable, overall. I am using an AMD graphics card on Linux Mint right now, and it works fairly well. But I will say, it still has some stability issues in comparison to the Nvidia drivers. It also lacks a good settings manager. But even that is being ironed out with newer Kernel updates.
Outside of the Valve influence. I still think Linux as a gaming platform still has some way to go. As there are other clients like the EGS client, games like LOL, WOT, Blizzard software, etc, that just doesn't run well on Linux. Also online gaming is still a bit of a mess with anti-cheat software blocking Linux compatibility layers. Etc. But things are really looking up.
It is interesting how the latest Windows 11 updates have been destroying DX/ OGL/ Vulkan / etc performance overall. Overall Windows 11 has still the best all around compatibility. I wouldn't say dump it altogether, for Linux. But if you have a secondary harddrive, or don;t mind making a Linux partitio, give it a try. Or if you have an older piece of hardware collecting dust, try a linux distro on that.
It is interesting how the Valve proton compatibility layer really destroys Windows 11 in a lot of those Gamers Nexus benchmarks. Really fascinating. Valve has really been killing it on Linux since the release of Proton in 2018.