But the reengineering of assembly lines has targeted speed and cost of assembly, not so much automation. Robots do have a role in manufacturing, but I think it's a relatively small fraction of the whole. AFAIK, most part makers don't rely on automation, and even though final assembly has had greater success, it's still far from as adaptable as humans are.

GM's Saturn was relatively early in that space but it didn't scale up anywhere as well as they had hoped. Likewise, Tesla went there 30 years later, but IIRC, they too experienced myriad difficulties building reliable automated manufacturing processes.

If automation among makers were ready for prime time, the work would have migrated to countries with the cheapest power and fastest mobility while ignoring labor costs. AFAIK, that still hasn't happened.