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.
I’m using WMs for 10 years now. Started with Openbox, currently running Bspwm for quite some time. Eyeing on River but not switching to Wayland yet thanks to Nvidia.