Robots are kinda fundamentally flawed and humans who apre professionals in their field are far more accurate than most people know of.

Let's imagine we have one robot making a part with 0.01" of accuracy. A second robot also makes another part at 0.01" of accuracy, and these two parts are then mated together.

They will never perfectly match. part could be 10.01" tall, the other 9.98", the next set 9.995" and 10.0012, etc. They're be really close, but they won't ever match. A robot can only build something to a set accuracy and match it to another object of a set accuracy, but it can't match them together.

And regardless of tolerances, robots are as equally brilliant as they are mind-numbingly stupid; they can only do what they're programed to do. If something unexpected crops up on the line, they're literally nothing they can do about it.

Take a human. Well trained professionals can feel the difference between objects in the nanometer scale^[1]. He could take those two almost-matching objects and sand/trim/etc them down so they could match perfectly.

This is why companies like Rolls Royce individually hand build each motor. Those pieces inside those motors are incredibly well matched together in ways no robot could ever hope to achieve.

Will there be full automation on the future? Sure. I'm pretty sure there are assembly lines even for cars like that out there now. But there's a pretty good chance they won't be as precise, accurate, adaptable, or as efficient as specialised professionals.

In Toyota's case, they're saving money and cutting down on waste by reintroducing about 100 people back into the line. In their case, they realised that they probably could go full automation, but it's not in their best interest. Whether or not it stays like that is up for debate, but there's some food for thought.