I’ve seen people suggest Ubuntu without mentioning Kubuntu, but it seems like most people (especially gamers?) prefer KDE Plasma. I’ve seen people complain about Ubuntu’s GUI and lack of customization, but then no one suggests them to try Kubuntu instead. It seems like people just don’t know that Kubuntu exists.
Also as an aside, people often criticize how slow updates are on Ubuntu/Kubuntu/etc, but if you enable the backports ppa then it’s actually pretty quick!
sudo add-apt-repository ppa:kubuntu-ppa/backports
They aren’t. Canonical enshittifies Ubuntu and the official flavors more and more. The hoops one needs to jump through (like OP’s PPA command because Canonical forbids proper updates) are not user friendly.
Steam Survey shows how Ubuntu’s relevance for home users continues to shrink and alternatives like Bazzite continue to grow.