Speaking on Bazzite, KDE is our default to match SteamOS, but we put more effort into the GNOME release if anything due to us trying to maintain feature parity with Valve’s KDE, including being able to right click and add to steam, use the desktop nested, enable VRR, add custom themes based on the ones Valve shipped, and add the steam deck wallpapers ported to GNOME.
That being said, GE’s points about GNOME are very real, and they have a lot of catching to do in regards to gaming. KDE has DRM Leasing, VRR and HDR right now.