catsclaw227 said:
I am not being disingenuous. The "standard D&D cosmology" as you describe is a Greyhawk thing,
Thus the "at least you should". Apparently you're just displaying ignorance. The following is a quote from the AD&D 1e Player's Handbook (published 1978):
APPENDIX IV: THE KNOWN PLANES OF EXISTENCE
There exist and infinite number of parallel universes and planes of existence in the fantastic "multiverse" of ADVANCED DUNGEONS & DRAGONS. All of these "worlds" co-exist, but how "real" each is is depends entirely upon the development of each by the campaign referee. The chart and explanations which follow show only the various planes tied to that of normal existence. The parallel universes are not shown, and their existence might or might not be actual.
Not, you'll note, the multiverse of Greyhawk, but the multiverse of AD&D.
Similarly, there's the AD&D 1e Deities & Demigods (published 1980), which has, Appendix 1: The Known Planes of Existence. The first paragraph is identical to the above quote. This book placed fifteen distinct pantheons on that set of planes, including three literary pantheons (the Cthulhu, Melibonian, and Newhon gods), but no Greyhawk gods.
Come October 1981, and in Dragon the deities of the Forgotten Realms are presented for the first time — all assigned homes in the planes of the multiverse of Advanced Dungeons & Dragons, as presented in the Player's Handbook and Deities & Demigods. And this is when the Forgotten Realms are still just Ed Greenwood's home campaign; TSR doesn't buy it for another five years.
Lots of references to the AD&D multiverse in the Monster Manual (1977), Fiend Folio (1981), and Monster Manual II (1983), of course, which were all generic AD&D books.
Then there was the 1987 Manual of the Planes, which covered the AD&D multiverse in detail -- but only included Deities & Demigods' historical pantheons and monster gods, ignoring all Greyhawk, Forgotten Realms, and literary-pantheon gods. A generic AD&D supplement, with no campaign-specific material.
These same planes are then presented on pages 131-132 of the 2nd edition Dungeon Master's Guide (1989), which treats them as the cosmology for the entire AD&D game, not any specific campaign. In fact, the (single) AD&D multiverse is given as the explanation as to how all the possible "world-settings" that campaigns can exist in can be accomodated.
So, no, the Great Wheel is historically not a "Greyhawk" cosmology; it was the common, standard cosmology for all AD&D for 23 years. Not everyone used it in their games, but that was the equivalent of house rules or campaign-speific variation (like Dragonlance not using the standard wizard class); standard AD&D included the standard cosmology.