Do you know how manufacturing takes place at all those other car companies in Germany, Japan, and South Korea? I can not talk about the Asian-based companies, but I know for sure that the manufacturing plants in Germany are very ahead. Because they produce different models at same time on the same track. Each and every car is different in every aspect. In Europe it is very common that you order your car they way you like it and do not buy the one that dealer has in its parking lot. You order to your specification and the option lists are huge compared to the one from Tesla.
Tesla is having only one Model with limited different features and many same parts from Ford, Audi, Mercedes, Bosch and others and still is unable to keep up with delivery as you can see from their latest IR reports.
BTW, the Tesla plant is build with German technology by German companies. Just to remind you.