I understand that unity-session is in the universe and the difference from main and universe repos, but my question is would Unity-session be considered as a part of Ubuntu, just as Gnome-session, or would install running only Unity session be considered as a distro outside Ubuntu, just as a distro based on Ubuntu?
Its not a question of, if Unity session would be maintained, looked after etc, but whether we can consider Unity as a part of Ubuntu.
The 3rd picture in your blog had Ubuntu, Gnome and Unity as sessions. If you’d uninstall both Ubuntu and Gnome, you are with Unity. What would you call such an install/distro? Would it be a non-Ubuntu distro, but just based on Ubuntu?