I am not sure. KDE is very customizable and I like the… regular way apps work, trays work, decorations work and all that. Also GNOME is like the anti-poweruser desktop. I like its style, but its like “use a terminal or nothing”. Needing extra apps for every small thing and all…
The downside maybe is stability… and Gnome does some things well, like quicksettings and all.
I also like that GTK is easier to develop for probably, with Gnome Builder and similar tooling. But at the same time, the UI would be pretty much unusable for complex apps like Dolphin.
I tried Gimp 3.x prerelease and well, GTK3 is weird, its already this step away from the more similar styles.
Well rebasing is pretty nice, its swapping out the foundation while keeping the top intact. For things like Kinoite->Ublue-kinoite-main its just a reboot.