Huh? 40 hr work weeks are a recent thing, many people in history worked 12 hr days 6 days a week. Technology and social progress definitely leads to fewer work hours.
I can really recommend the book Blood in the machine if anyone is interested in how automation early on affected workers.
Do they? Seems more like developed countries just outsourced the sweatshop factory work to other countries. "Out of sight, out of mind" as they say, I guess.