He’s just flat out wrong about gaming. I haven’t had to put in any special “commands” (unless he means the tick box in steam settings to allow compatibility on all games, which I checked once and didn’t have to futz with anymore…) and I haven’t run into a game I wanted to play and couldn’t. I’ve heard that games that rely on aggressive root-kit anti-cheat don’t work, but I’ve avoided those titles on principle for a decade at least. But if those are titles you want to play, then yes, you’ll need windows - no amount of tweaks or commands will make them work in Linux because of the game developer’s choices.

That said, it really makes me wonder if gaming on Debian derivatives is worse? I can only speak to what I’ve used which is fedora based and arch based. And no I don’t constantly run into issues with either. I’ve spent less time “fixing” stuff since I switched to Linux, not more. Ymmv.