Alzrius
The EN World kitten
I'm still not convinced that even the interconnectedness of the various worlds and crystal spheres necessitates a sameness in metaphysics, nor that it places culpability on the faerunian gods by having a different setup.
You're right not to be convinced. There are metaphysical differences in several of the official campaign worlds.
There's the issue of the Fugue Plane and the Wall of the Faithless for the crystal sphere around Realmspace (though only for those who worship the Faerunian pantheon).
In the crystal sphere around Athas, the Border Ethereal is completely replaced by the Gray (and, within the Gray, the Black). Everyone who dies on Athas goes to the Gray, where they lose their memories and exist in the same dreary afterlife regardless of how they lived their lives.
In the crystal sphere around Aebrynis (the planet of the Birthright setting), there's the Shadow World (also apparently replacing the Border Ethereal). It doesn't affect the metaphysics of the afterlife, but it's still a fairly major departure from how things work in most crystal spheres.
In the Clusterspace crystal sphere (from The Astromundi Cluster boxed set) a group of wizshades have linked themselves to the fabric of the crystal sphere, making it impossible to physically leave unless you're riding on a living ship. Planar travel is also affected, in that if you go to another plane, when you return to the Material Plane you must re-enter Clusterspace; you can't use the planes to hop from one Material Plane world to another.
Mystara was kicked over to AD&D 2E towards the end of its life, with its deities appearing as living on the Outer Planes. Presuming that the rest of the setting is kept as-is, that makes it notable that all of its gods are former mortals, and there's a semi-formalized process for helping new mortals ascend, even if it's only rarely completed.
This can be summarized by The Planewalker's Handbook, for Planescape, which notes that Material Plane worlds are all very different, and that it's dangerous to go to one assuming it's just like every other world.
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