An evolution of the South Carolina plant:
https://www.youtube.com/watch?v=xqLekwkLspo
The initial investment is high though once done the quality control is void of human error. Tolerances are reduced far beyond consistent human capabilities. And, over some period of time the payback is stellar.
Chasing the lowest labor rate often had far longer paybacks due to the training difficulties, the cost of start up delays and length of time to achieve consistent quality--lots of scrap. CFOs began questioning the sanity of moves as shipping costs and labor rates started escalating much faster requiring sooner moves to the next option. It still makes sense with some products but the options of where to go that is reasonably safe makes it even harder to justify the next move.
My preference would be to buy from newest plant after the humans get the bugs out.
So far we can turn the power off.