Proprietary software needs a stable ABI. Not games.

DOOM runs on any Linux system since forever because we had access to the source. You can build it for Linux 2.6 and it’ll probably still work today.

Sadly most games are proprietary

Even if all games were FOSS, without - at least - a stable API, most games will remain a hassle to run. DOOM doesn't deal as much with this due to the high amount of volunteers, but relying on community support for all games is just outsourcing labor to some unlucky fellows. At best, it's yet another pain for Linux users. At worse, it's the death of unpopular games. Either case, a hurdle for Linux adoption.