How old are we talking? The nvidia open-source drivers dropped support for everything prior to the 20-series i think? but the closed-source nvidia drivers still support older cards.

If you have a theater nearby that offers Dolby Vision films you can try out a version of HDR. They use laser projectors so the blacks can really be pure black. When the screen goes dark just before the movie the entire theater will be pitch black except for emergency lighting. It’s glorious.

aesthetics, i would guess. everyone has different tastes.