The TESLA EVs are so much better than the competition because they are EVs from the ground up. That was Musk.
The competition's engineers mostly stuck an electric motor into an ICEV and thought there you are, an EV. Wrong. Maybe now they are catching up
Musk has either the ability to blue-sky think and come up with original solutions, or has the ability to grab the ideas of others. That is his great strength. (Add space-X, big batteries, solar roof tiles (great idea if it works)).
But production is a machine, starting with an order and finishing with a delivered vehicle and money in the bank. The best machines work smoothly, able to respond to different levels of demand smoothly, obviously within limits.
Musk makes every quarter end a mad panic rush. Surprise, surprise, in the first month of the next quarter production, deliveries and all are a mess, workers and managers lying around in exhausted heaps.
As a production manager Musk is rubbish. Musk is misusing his and his company's resources. Send him off to the invention and product development shop.
That is my speculation that belongs to me