Yep. I got a thinkpad a couple years ago that was enough of a deal that I forgave its nvidia GPU. I followed the documentation on how to connect a repo controlled by nvidia, and since then: a) the actual GPU appears to be used, but b) maximum brightness on the screen is significantly dimmer, and games run worse than they did when the GPU wasn’t actually used.
And also I use KDE. I’m still on X11, though, so I didn’t complete the set.
I haven’t, but a colleague (small all remote web dev outfit) plays rocket league and had said that pop!os has felt great for games without having to tweak anything. Meanwhile, I tried to play through cult of the lamb while some friends were all playing through it and it wasn’t playable