Toyota put a stop to this bullshit in the 1960s. They instituted the policy of stopping the line to bring attention to every problem- and then solving that problem so it never happened again.
They did not need and never built the big room at the end of the line where quality control techs went through the car to make sure it was screwed together properly.
Many, if not most other manufacturers have long since followed suit.
That's what the Malcom Baldridge Quality Awards in America are all about. In Japan, the same thing is called the Deming Prize for Total Quality Management, named after the American who pioneered the practice after WWII.
https://en.m.wikipedia.org/wiki/W._Edwards_Deming
Read 'The Machine That Changed the World' by James Womack, et al
Read also 'The Deming Management Method' by Mary Walton
No credible manufacturing facility just slaps shit together anymore and expects to stay in business. Musk is a huckster and he's about to be caught with his pants down.