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I don't think Fallback is Gnome 2 it looks and works like Gnome 2 but is:
I thought you were referring to a real gnome 2, I must have missed that somehow in the context of the discussion. Well that's too bad.
I vaguely remember trying the gnome 3 "fallback" desktop, I think it lacked alot of support for customisable widgets and panels. It was a theme to make gnome 3 look more like gnome 2, but that's about it.
Is there anything more to talk about? Guess not.