Not counting the Steam Deck, since KDE isn’t actually turned on while you’re running games.
Normally I’m a Gnome guy, but I’m building a tiny low power portable computer and wanting to keep resource utilization low, so I’m investigating other options.
Until two months ago I was using gnome Xorg to play my games. Then I bought a second monitor for my games station and I had to switch to plasma Wayland to still use the freesync. So now I’m using kde plasma to play , but I still prefer gnome, and probably switch over again after they implement the vrr patch for wayland.