[MENTION=518]JeffB[/MENTION] Yeah, that's largely my feelings on the issue. I have no problems with Planescape being its own thing. Doesn't bother me in the least. But, for some bizarre reason, unlike all the other settings that either TSR or WOTC have banged out, Planescape gets to infect every other setting. We can't have a core setting with a different cosmology, without first paying lip service to Planescape.
I mean, everyone got up in arms about adding dragonborn and tieflings to Forgotten Realms. Yet, for some reason, we're supposed to just accept that every single D&D setting MUST be in line with Planescape lore.