I test many “flavours” and also I have “Frankenstein” systems, based on Ubuntu, even have a clean Openbox system. I am the first to test Lubuntu and give a feedback, when you asked.
I also have Gnome on pure Arch, Fedora, OpenSuse Tumbleweed and Ubuntu default on bare metal, so when I say “the default” is just one of many, I know what I am saying. One should really read OpenSuse’s Wiki(s)!