Campaign World Metaphysics
So here's my question to you all: how important is it that the DnD universes you play in have consistent metaphysics underlying them, and have you ever played in a campaign with such metaphysics? By metaphysics I mean laws of the universe that explain why the universe is the way it is, where the planes and the worlds come from, where races come from, why magic operates, etc.
Also, do you think that the published WOTC worlds have consistent metaphysics? I am alos especially interested in this question. What are the metaphysics of Forgotten Relams, Greyhawk, and/or Ebberon?