[gnome] Confusion surrounding GNOME classic/fallback/flashback sessions

view story

http://ubuntuforums.org – Is this factually correct: Beginning with Oneiric (11.10) Ubuntu switched to using GNOME 3 as it's base and Unity as the default desktop environment using the Compiz window manager whereas GNOME themselves used the new GnomeShell DE with the Mutter window manager. As a "fallback mode" for hardware that wouldn't support the Compiz window manager Ubuntu offered the Unity-2D session using the Metacity window manager whereas GNOME themselves offered a "fallback" session that was presented as "GNOME Classic" or "GNOME Classic (no effects)" at login in (Hardware)