To be fair there still is a lot of tinkering involved to get gaming on Linux working properly (unless you’re on the steamdeck, but even them you’ll have to tinker for anything that’s not verified). Switching proton runners, changing launch options, fighting updates. It’s definitely more than most people are willing to deal with. For me personally, I’ve had to stop updating my video drivers because Nvidia 555 causes all Proton games to crash for me.
I enjoy the experience of tinkering and troubleshooting, so I’m okay with all that, but I completely understand why most people wouldn’t want to use Linux for gaming.