I'm a Linux desktop user and I drop into a game once in a while while I'm waiting for another meeting or waiting for a build to finish or whatever. My work desktop doesn't use VRR (the just-for-games PC uses Windows), otherwise I'd be in the same boat as 'jorvi because it quite matters to me that games on my desktop integrate into everything else at a passable level. For me, GNOME does a better job of integrating my different activities than KDE (which wasn't always the case! I was a KDE3 user for a long time!), so I use GNOME. And it remains an unsolved pain in the ass that the Linux desktop experience isn't coherent enough to mean that we should only be thinking about desktop environments if we want to.
Coherent, holistic switching between tasks is a thing that people are allowed to want and attempting to convince people that they don't is a bad look.
> If this is a machine you use for something else too, you could just have a gaming user that logs in to KDE and your normal user that uses Gnome?
This is a really sad observation on the state of the Linux desktop. Still.