There could be a vicious cycle where game devs who want to be taken seriously don’t touch mobile games, so as mobile game devs develop skills and experience, they move away from the platform.

Also a lot of the thick frameworks that many devs rely on these days require a lot of computing resources that maybe mobile devices have trouble keeping up with. I could see scenarios where a mobile game is worked on for a while but abandoned due to awful performance in early testing while a similar desktop game doesn’t get killed because it’s being developed on a high end system and later gets optimized to run better on weaker systems.

Though tbh, I have no idea how top phones compare with high end desktops these days and am just assuming that they are way behind, while low end desktops might be more comparable to high end phones for performance.