The key to a Prime world being planar rather than planetary is, I think, its theology.
Among the planes of Beyond Countless Doorways are campaign worlds which are, essentially, Prime. The (not always fair) reviewer Turanil felt that Avidarel and Carrigmoor did not need to be separate planes. They act as magically-induced pockets of outer space in the Prime plane. They are even able to conduct (shady) trade with other "planes", of which at least Toorantis is also "Prime". While we remain on this topic: Dendri, the Lizard Kingdoms, Tevaeral, Venomheart, Yragon, and several of the "summary linked planes" are also more like planets than planes. Mimesis would require a reason for their planar separation.
The gods of Krynn and Scarn, and their isolation from other planes, have made of each world what it is. In BCD a plane's theology would manifest as a conjunction to an "outer plane".
At present, Dendri has two nasty planes next to it, but they do not seem to be divine in their hellishness and neither sports a god of arthropods. As for the footnotes: Serran is also atheistic, and Triala's elites apparently think of themselves as the arbiters of good and evil on their world.
Avidarel and Venomheart have a heaven each (but no native faithful to go there), Tevaeral has a hell, and Yragon is most decidedly in severance against the multiverse's gods. That seems about right for each. Avidarel seems particularly interesting in that it is waiting to be born again at the same time as conjunction outer-plane Colaris is waiting to be born for the first time.
The sidebar for the Lizard Kingdoms's conjunctions omits links to heavens and hells; but the text does list gods and describe a working priestess, so the plane(s) for its gods should be added. These "proprietary" outer planes are probably in severance against others.
Among the planes of Beyond Countless Doorways are campaign worlds which are, essentially, Prime. The (not always fair) reviewer Turanil felt that Avidarel and Carrigmoor did not need to be separate planes. They act as magically-induced pockets of outer space in the Prime plane. They are even able to conduct (shady) trade with other "planes", of which at least Toorantis is also "Prime". While we remain on this topic: Dendri, the Lizard Kingdoms, Tevaeral, Venomheart, Yragon, and several of the "summary linked planes" are also more like planets than planes. Mimesis would require a reason for their planar separation.
The gods of Krynn and Scarn, and their isolation from other planes, have made of each world what it is. In BCD a plane's theology would manifest as a conjunction to an "outer plane".
At present, Dendri has two nasty planes next to it, but they do not seem to be divine in their hellishness and neither sports a god of arthropods. As for the footnotes: Serran is also atheistic, and Triala's elites apparently think of themselves as the arbiters of good and evil on their world.
Avidarel and Venomheart have a heaven each (but no native faithful to go there), Tevaeral has a hell, and Yragon is most decidedly in severance against the multiverse's gods. That seems about right for each. Avidarel seems particularly interesting in that it is waiting to be born again at the same time as conjunction outer-plane Colaris is waiting to be born for the first time.
The sidebar for the Lizard Kingdoms's conjunctions omits links to heavens and hells; but the text does list gods and describe a working priestess, so the plane(s) for its gods should be added. These "proprietary" outer planes are probably in severance against others.
