This question was inspired by my hatred of Temporal Anti-Aliasing which, in many games nowadays, is poorly used as a performance bandaid. On lower resolutions it will smudge and blur the image and certain bad cases of TAA will cause visible ghosting.
Yet in spite of all this, certain games won’t let you turn it off or have hair/fur/foliage look like dogshit without it so sometimes I still use it.
One major issue with Linux gaming is anti cheat that actually secures the client. Things like eac or vac have to cripple their client side protections on Linux because they can’t put in a kernel level module that can’t be replaced by anyone else. On Windows those kernel level modules are signed by Microsoft which then makes it extremely tough to break on that level.
This is likely a reason why you won’t see valorant on Linux.