Sharpness/realism isn't necessarily a must, but I do love when it to looks like this:
Or this (in 32:9):
Screens are from Robocop: Rogue City (1440 top, and 3840x1080 32:9 bottom). It doesn't bother me to play games that don't look like this, but damn does Unreal 5 + Lumen look really good! More importantly, I love HDR and smooth frames via GSync on my OLEDs, which is why I prefer a lower res vs 4k so that I can hit 120 fps/Hz locked in most newer games. That's the sweet-spot. But I don't crank up anti-aliasing too high because then you get the paper cut-out effect with objects which I don't care for. Graphical mods I'll only use on older titles, like Skyrim.
I do love 4k, particulary UHD HDR, but only with movies. In which case, like
@Kaamos_Llama I also have a 4k UHD Player and still buy movies on disc.
They also sound better, too . But that's for the HT room where 4k is more noticeable with a larger display. For gaming, I'd rather drop the res down for performance, and 4k res isn't noticeable anyway since the TV and monitor I use for gaming aren't large enough displays to see a significant difference over 1440.