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Message: <blockquote data-quote="Hastur00" data-source="post: 6131596" data-attributes="member: 72532"><p>This strikes me as more of an issue of convenience than anything else.  If you've got planar creatures, they're probably going to interact.  If they're heavily troped, like Angels vs. Demons, they'll interact all the more.  If you've got planes of existence that are implied by core material but never fully fleshed out, there are going to be questions that remain.  Treating every aspect of planar core material as existing in a vaccuum saves room in books, and is useful in that there's no pre-existing setting information that a homebrewing DM will have to strip out, but that'll leave a lot of work for the DM to do, and it always has; that's one of the reasons the campaign worlds exist in the first place.  Unless you're willing to have the core books be perfectly modular, without context, then you'll need a default; some common ground in fluff and/or crunch.  Considering how much work went into the Planescape setting, that might as well be it.  It beats the crap out of having to make up the whole damn cosmos yourself, IMO.  And it goes double if 5th is supposed to be backwards compatible; more available material makes for a richer setting, and keeping Planescape material as canon will reduce contradictions.</p></blockquote><p></p>