Although there is always more work to do, that doesn't mean there's always people who want to do it. Interestingly enough, I think part of the reason for advancement in technology (on farms) was not only for greater profit, but also to replace the hard to find work. Sure, "anyone" could work the farm, but that doesn't mean they were any good at it OR they wanted to do it. Having read books about migrant workers, they were very poorly treated and extremely underpaid - both because they were "undocumented workers."
Now adays you can't get "documented" workers to break their backs on farms, so technology plays a great role in that sense. Unfortunately the same people who don't want to break their backs, I would argue, probably don't want to take the time learn anything demanding because in the end, the people who are willing to break their backs, we could say are willing to do anything for work including learning things for better opportunities in life.