They did not inherit. In an interview, Musk said that when Tesla took over the factory from NUMMI, there were only bare walls from the paint shop. Tesla had built the paint shop a long time ago, when they produced tens of thousands of cars a year. The paint shop is the most expensive part of the car factory and was not designed for such volumes, but rather they only gradually modernized it. Probably the reason for the problems they have with the paint.
Musk also said that they needed a new paint shop, but that it was a problem to do during operation and there was no room for a new one. Shanghai and Berlin, of course, have new paint shops designed for these volumes. In addition, Berlin is said to have some super modern paint shop.
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I can’t wait when Tesla cars will be available in India