How can D&D have cannon? Literally everything that happens at my table has nothing to do with whatever happens at your table. And every edition they re-write all the gods, powers, power sources, etc. anyway. Are there novels that people are talking about? Even still, the entire point of D&D is that you make your own stories, so there's no real "centralized" world to speak of. Even stuff like Forgotten Realms and Eberron are just basically lore modules you can bolt on as you like.
You can't be a Master of something if there's nothing to master.
