[WheelsAtLarge]

https://www.forbes.com/sites/lensherman/2018/12/20/tesla-sur...

To start with, this article of many articles on the subject. Plus Musk has spoken on the subject too.

Manufacturers have known for decades that over automation is a problem. The dream is to put raw resources at one end and get a finished product at the other without humans touching any of it. The closer you get to total automation the harder it gets to do it. There's a fine line that must be found.

Tesla has not shown that they have found the best manufacturing process so they should get help.

Also, it is almost never the best practice to produce a product 100% in-house. It requires too many resources and it's very hard to do it at the lowest cost especially in low quantities. They aren't producing their product 100% in-house but from what I've seen in the past they've tried to produce as much as possible in house. Like I said there's a fine line that needs to be found.