That's a great theory, until you realize that Tesla's been around 17 years, and that for a lot of their issues they really could crib notes on how other vehicle manufacturers do things. A huge amount of their QA issues around non-drive train components are solved problems everywhere else, and they've been at it for a while now.
They've been making at least 10K units a quarter since Q1 2015. I'd hope that in half a decade they would have figured out how to make the body panels align and stay attached to the frame.
Complaints about Tesla's fit and finish extend back to before they were mass producing vehicles, when they theoretically should have been able to hand fit them. So I really don't buy any argument about it being a problem with scaling up; they just seem incapable or disinterested in fixing this.
