Tesla took so long for production because Charlatan-In-Chief didn't want to use any of the lessons learned about Auto Manufacturing the past 100 years and decided to do it his way.
Charlatan-In-Chief also assumed he knows more about A.I and Robotics than many who warned him about his 'Alien Dreadnought' vision.
Rest assured people who are focused on building mass cars won't have the same hubris