Bedrockgames
I post in the voice of Christopher Walken
Im not getting dragged into relitigating nearly a decade of assessment of the core 5e books.
Everyone knows what these books are and how poorly they're set up to actually instruct anyone on running a game.
Trying to dispute nearly a decade of acknowledgement of this problem only now because its devastating to a side argument in this topic is a waste of time and I'll have no part in it.
If you think 5e does a good job at teaching DMs more power to you, but you're disagreeing with a decade of people saying and proving otherwise.
I don't play 5E but I only see a handful of people online making this argument and an equally small number offline. Most people I know who play 5E, when they have quibbles about the books, it is about other things, not whether the game is bad at teaching GMing. The only edition I think had a major problem in giving GM instruction is my favorite, which is 2E, because they put half the DMG in a separate release called the Campaign and Catacomb Sourcebook.