My guess is that the complexity of integrating sensor information and maintaining calibration isn't refined to the tolerances needed. In theory, you only need t

My guess is that the complexity of integrating sensor information and maintaining calibration isn't refined to the tolerances needed. In theory, you only need to detect physical resistance and visual variations (not like the assembly line workers are licking the bolts). In practice, you can have a series of bolts within tolerance limits, but causing a warp an attached piece that lies outside the preceding sensors' detection ranges. A human might step back and see that the door is bending weirdly, the door bend might not be noticed for several stations, causing more disruption. That being said, car parts in general seems so unnecessarily complex. Too many curves, too little compartmentalization and modularity, etc. At this point in history, I would expect the average person to be capable of practically disassembling most cosmetic pieces in under an hour and with little research, but it's an obnoxious process of hunting down hidden screws and plastic clips in precise sequences. If cars were built in a reasonable manner, it should have been trivial to repurpose most of the parts in these vehicles.