At the time this manufacturing change was underway in Shanghai, CEO Elon Musk wrote in a tweet : "Oh man, this year has been such a supply chain nightmare & it's not over!" Tesla has struggled with manufacturing challenges throughout its history, but the completion of its Shanghai factory in 2019 helped it increase production, expand margins, and gain market share beyond North America. This latest decision reveals new pressures as the company pushes further into the mainstream, and aims to deliver on Elon Musk's promises of a self-driving future.