I've worked those jobs when I was younger - none of those people would feel any shame quitting for a better job so I'm not sure what your argument is.
Yes and how do they find a better job without education? You are very fortunate that you were able leave that behind you. But do you realize there are millions of people in this world who have no means of pulling themselves out of the dirt?
It wasn’t easy or fair in preindustrial times. People worked a few hours less on average, but they received less wealth in exchange and had no opportunity to educate themselves and grow wealth. Serfs were not given a choice of job or even the ability to leave or marry without their lord’s permission. Peasants were stuck for life, unlike someone who works low paid 2-3 jobs today.
Not the kind that counts to most employers (college degrees). That form of education has never been more expensive.