Dungeonosophy
Legend
Interesting synthesis Mike Mearls.
Still, as a "technical clarification" (perhaps in a sidebar), I suggest that 5e include the "D&D Realities" concept from Bruce Heard, whereby each of the different ruleset "lenses" through which the D&D worlds have been viewed-- OD&D, Classic D&D, 1e, 2e, SAGA, 3e, and 4e--are each nominally a different Reality.
https://sites.google.com/site/dndphilmont/d-d-realities
The 5e cosmology Mike describes would be the depiction of the "5e Reality".
Still, as a "technical clarification" (perhaps in a sidebar), I suggest that 5e include the "D&D Realities" concept from Bruce Heard, whereby each of the different ruleset "lenses" through which the D&D worlds have been viewed-- OD&D, Classic D&D, 1e, 2e, SAGA, 3e, and 4e--are each nominally a different Reality.
https://sites.google.com/site/dndphilmont/d-d-realities
The 5e cosmology Mike describes would be the depiction of the "5e Reality".