Debian is too slow with updates for gaming. Idk why not having an upstream is desired, SteamOS has Arch as an upstream. And I was suggesting Red Hat the company and Fedora KDE the distro.
Why is it weird to prefer Kubuntu? Ubuntu is just not as good, it pushes Snaps harder, and it uses GNOME which I don't like either. I just like Kubuntu a lot more than Ubuntu, and I think many other gamers would agree. Also SteamOS uses KDE Plasma, so it's the same (except Kubuntu is more up to date, especially with Backports)
I think Kubuntu should be the more popular one, and Ubuntu should be the one that is weird to say.