I mean, you are right, and way more people should be using openSUSE :P
I will say Arch-derived distros are a good experience if you want to learn how the terminal and other systems work. They're engineered to be configurable; the documentation is great. But if you just want to use your computer without opening too many hoods, it's fundamentally not an optimal system.
Another thing is that many people just want their new laptop to work, and for it to game on linux. Sometimes it does not just work. If you start pulling in fixes and packages that are not supported on your distro, you can screw up any distro very quickly (and this includes the AUR, unofficial Fedora repos and such). If the community packages these, stages them, tests them against all official packages, and they work out-of-the-box... that's one less hazard.