GNOME Shell is, ultimately, just one component in the GNOME DE. I can use it without many of the other trappings of GNOME, like GDM or Nautilus. It seems very weird that gnome-panel - a thing of distant past - is an independent tag, yet, gnome-shell is a synonym to gnome. By whatever logic that makes gnome-shell a synonym of gnome, one could synonymize practically every GNOME app tag to gnome. gnome, both by its wiki and what GNOME is, should really be for questions about the desktop environment or the GNOME project as a whole.
Failing that, rename gnome to gnome-shell - if it is really for GNOME Shell the shell, then that should be reflected in the name. As it stands, gnome gets involved in every question that mentions GNOME, especially if it is Ubuntu GNOME, in which case both gnome and ubuntu-gnome get involved. This is quite senseless.