There's still room for improvement, but Linux gaming has come a long way in a short time.
I remember when Proton launched it was like magic playing games like Doom and Nier Automata straight from the Linux Steam client with excellent performance. I do not miss the days of having the Windows version of Steam installed separately.
In the time I have been a Linux gamer, it has gone from "here is a list of games that work in Linux" to "here is a list of games that do not work in Linux." Which some dictionaries define as "progress."
That's crazy! When I was last trying to run Linux full time in ~2014, you had WINE and then a commercial version of WINE (not by the WINE devs, but because WINE is licensed the way it is and is open source...) that would run a few more things, but I don't remember what it was called.
So glad to hear it's progressing this quickly and far.
That would be CrossOver by CodeWeavers. They're actually a huge contributor to upstream Wine and have worked with Valve (and I think Collabora?) several times over the past few years. I'm kind of tempted to buy a copy of CrossOver to support them even though I'd never use it, lol
I think that a good chunk of Apple's GPTK is based on the work that CodeWeavers have done, which has made me tempted to shell out for Crossover too. £60 is a fair old chunk just to play games on my Mac though.
I started out in 2014, and pretty much what I did was look to see if there was a Steam logo on the Steam store page to indicate Linux compatibility. With Proton in the last few years, I just don't really worry about it. I will say my tastes have just about always lined up with the kinds of games, the kinds of studios, that are likely to publish for Linux, the nerd shit like Kerbal Space Program and Factorio. I don't play Call of Fifa, Modern Fortnite or whatever.
In 2003, it was my dream to play FF7 in Linux. In 2019, my dream came true. Thanks Proton, Codeweavers, Wine, Valve, et al for helping me finally put down Sephiroth right.