Yes I know, but D&D fantasy is built upon those things from Apoendix N originally. So is a current version not so closely tied to it still D&D, or has it already become something else?
Would you be able to set up tables playing 70s version, 80s version, 90s version, etc, Pathfinder, Daggerheart, Draw Steel (this is the Colville one or is that Cosmere?); and walk past each and without seeing the books know which was D&D and which was not? How would you tell if not by the "Appendix N" that drives them?