I think that's basically the Elon playbook. He did it with the supercharger team as well at Tesla.
Imagine structural engineer thinking like this.
I'm not sure if that was how it really worked out.
Then you are wildly mistaken about the field of engineering.
Imagine needing to add back 20% to a bridge because you removed too much, or a rocket ship, or a team of nuclear scientists (like is actually the case here).