Most games are strictly scaled on resolution due to how deferred pipelines run. This is exactly the slider to max or not max everything on a gpu for games. The more pixels the more memory and the more compute.
If you're rendering at native resolution, which many PC gamers do, going higher isn't significantly better because it just helps with antialiasing via supersampling. There's no point rendering so much more pixels just because you can, that's just a waste of electricity.