[1] Case in point: glibc's compatibility guarantees are weaker than what you get on Windows. (For instance, your system's glibc cannot be older than what a game is built against, which may present problems for devs using Fedora/Arch and players on Debian/LTS Ubuntu, something I've experienced first-hand for my apps.) The X11 to Wayland migration is also still underway. (Though things are getting better, the attitudes of some Wayland maintainers are a bit concerning: "I don't [care] what you think is normal behavior for games. You get certain guarantees with wayland. Deal with it. If clients decide to do exactly what they do on windows or X11 they won't work correctly." [3] I'm not sure game developers would enjoy such reception.)
[2] https://store.steampowered.com/hwsurvey
[3] https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18...
Windows is going to end up as the 2030s version of dosbox
edit: as in Windows ends up with the same fate as MS-DOS: replaced with a piece of software analogous to dosbox