That leaves us with the previous sentences, in both senses of the word.

Quote Originally Posted by SCAG p20, The Afterlife
Souls that are unclaimed by the servants of the gods are judged by Kelemvor, who decides the fate of each one. Some are charged with serving as guides for other lost souls, while others are transformed into squirming larvae and cast into the dust.
From this, I get that:
  • Lacking divine sponsorship still bars you from simply reaching the plane of your alignment. Could Kelemvor let you go if you work hard enough?
  • The bit about larvae suggests that the Fugue Plane is still part of the Gray Waste of Hades, though it wouldn't be incompatible with the Shadowfell.
  • Even souls who escape that transformation are left in a bleak environment, probably more undead than afterliving.
  • Kelemvor effectively claims souls by default. And unlike Hel in OotS, he is not forbidden to have a living clergy. Not a bad portfolio, eh?

Well, I don't mind this. You can easily headcanon that it is the nature of the Fugue Plane to trap souls, which can then only be freed by divine intervention. Whereas the Wall was difficult to see as anything but a deliberate punishment for not worshipping the gods.