As to those automated assembly lines, a friend works for Fiat Chrysler, he drives and stays at Belvedere Il for weeks on end then comes home as can. They attempted to automate the lines for body weld assembly, was fine until the first glitch, destroyed three days production run of body shells, welds in wrong spots, failure to adequately fuse, these made it thru to paint where they started falling apart in the paint vats. They had five personnel trying to do QA on these as the machines churned them out, failed to catch them then had to shut down for two weeks to determine Which robotic welder had sneezed out of fifty of them.
Machine in question had a tight bearing on a rotation joint, would slip and set erratic position indications, then slip back and run as normal. Machine had no idea it was FUBAR.
Line is still automated but there are now seventeen techs walking the floor and fifteen QA associates looking over the bodies. Oddly in that there were only 30 personnel on the floor swinging spot welders and four QA prior to automation.