This is simply not true. I recently tried Linux for gaming after several years because I read that Valve made some great progress. Installed Crusader Kings III and didn't get Paradox Launcher to run which is necessary for any DLC.
This was literally the first game I installed from my huge library and it simpl didn't work so I had to do two hours of research, trial and error and reading error logs to conclude that I wasn't able to solve this problem.
This is the exact reason why I use Windows for gaming. It simply works 99 % of the time. And I don't have the time to troubleshoot my games all the time.