Can you blame him? He hasn’t needed it until now. His companies either specialize in binary-outcome engineering challenges (rocket flies/explodes) or products where Musk himself is the user, like a kid designing his own toys (and calling them “S/3/X/Y”). Turns out that a lot of people want to drive the car that he wants to drive himself, so he probably thinks this impeccable taste applies to any kind of product.
But Twitter, unlike a car, is used by hundreds of millions of people in thousands of completely different ways. He has no idea of what the experience is like for someone with only a handful of followers, or blind, or trans, or Algerian, or retired, a teenage girl, a suicidal anorexic, etc. etc. — and he doesn’t seem at all interested in trying to understand.