GNOME has very little settings.

I actually gave Fedora Silverblue a try, documented here. This was not beginner friendly at all and still lacked many features in the end.

So this is the issue when GNOME doesnt allow basic things, like editing desktop files in a guided way, showing package names etc.

Ubuntu has had broken packages for a lot of 3rd party software (when I last used it, a few years ago), for example SciDAVis which I used, and Libreoffice and more. Flatpak works without issues here. Beginners will not add Flatpak and have issues here.

I didnt say anything about Arch I think. He also doesnt care about that. Using Arch as base really just makes sense for Valve, as it is neutral, not legally restricted etc.

uBlue deals with the constant sync (and coordination) issues between Fedora and rpmfusion. When using Arch, this is not needed.