Having used both, I actually wouldn't agree with that, at least on Arch Linux I've had more problems with GNOME stability-wise. I think it's because they have a tendency to make breaking changes between releases. Maybe this wouldn't be true for fixed-release distros, though.

Once GNOME reintroduces theming, fixes fractional scaling

Theming is already working, it just took a while for people to get their themes ported/create new themes since theming GTK4/Libadwaita apps and the 40+ shell is so different from before. But as I learned from scrolling unixporn, there's quite a few options available now. And as for fractional scaling, there's a spec that was recently introduced into mainline Wayland for that that GNOME is going to be implementing, though right now the spec is only compatible with QT6 and probably won't support GTK until GTK5. I believe that spec also includes a fix similar to the one Plasma uses for XWayland apps but I might be wrong there.