Quantumantics

Oh, they have KDE in their repo, it’s just not the out-of-box default.

If you’re okay with something other than vanilla Debian, give Linux Mint Debian Edition a look. I used it for years without significant hiccups playing a wide variety of games. I switched to Bazzite after testing it out and liking the immutable aspects of it (though as another commenter mentioned, there is some pain involved in the learning curve), but I still keep LMDE around on my old gaming rig and on a couple other computers of mine.