As far as I know almost all (if not all) anti cheat software just does not work on linux therefore "gaming on linux has been awesome for years" is not true if you play games online or competitive.
I recently got into playing Helldivers 2 with some family members and luckily for me it works just fine.
My opinion is that Linux gaming is most suited for majority single-player gamers like myself.
This has a good list of what works and what doesn't: https://areweanticheatyet.com
Iam not sure if I care whether the AC software does work (theoretically) on linux. Most of the games with AC cannot be played on linux. (You can see this on the graphic you linked).
I tried it long enough. I played MTG Arena with lutris and every patch day was a frickle.
I don't even play FPS games seriously, let alone competitively, but many of the games I play don't run on Linux. It's that simple. I've been using Linux daily for 25 years, but I have a dual boot with Windows. A week ago, I taught my NixOS to boot with secure boot because the new Battlefield requires it—and other games will follow.
This is like saying you won't stop smoking because then you might get less cancer.