Thanks to LD_PRELOAD you could downgrade tons of OpenGL effects and enforce some settings for high end games and make them playable with good speeds on legacy systems.

Also to force texture sizes and whatnot.

I wish Wine/Proton had options for those, to override antialising, texture sizes, rendering resolution and everything.

that's an interesting pursuit. we've got the code, or at least we've got the stubs calling windows dlls.