> In parallel I don't understand gamers with 15 years old hardware leaving bad reviews or whining when a game chokes above 720p with minimum settings.

I game on 1080P and never have issues with any games I play, though I am on a 3080. It's definitely people trying to max out every setting for their 4K monitor that they overpaid for. I might be giving 2K monitors a try soon on the other hand.