“Complete understanding” sounds like Musk’s self-promotion. What he understands is that by assembling a team of talented engineers, success is possible (but by no means guaranteed). Without that team, and a force driving it from the top, Tesla and Space-X would never had happened.
Understanding engineering and doing engineering are two different things.
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He essentially manages thousands of engineers and makes many suggestions to them. Why don’t you find one who says Musk doesn’t understand engineering?
I should have said “Saint Elon”.
My bad.