I can also imagine that it minimises the tail-risk, because a human can come and fix it. If he would not be there and a critical error occurs, it could take dow

I can also imagine that it minimises the tail-risk, because a human can come and fix it. If he would not be there and a critical error occurs, it could take down the whole factory in time before help arrives (maybe even something trivial as a misplaced item on the belt).