Originally Posted by TheDarkDM
I'm a fan of all of us starting out on the same planet. Giant, empty rock spinning through space, maybe some light vegetation and water. Gives us a reason for mortal societies to interact without needing to invent interstellar travel.
That is not what I mean. I mean, how will the planar arrangement look like? Will we go with the usual approach of "The Void is outer space, with the Material Plane and the rest of the planes as worlds floating inside" (This is, in some ways, Eberron's approach)? Or make them all metaphisically separate, more like it works in the usual D&D cosmology of the Great Wheel.
Multiple planets is bound to not work. Heck, multiple continents can lead to some serious stagnancy.