It might be better to call it low skill or something like that. The point is that there are jobs that can quickly be taught on the fly and have you productive in a few days, and that this is different from jobs that may require years of potentially highly specialized training. Working in a McDonalds Kitchen and in an Amazon warehouse are both much closer to the former than to the later.

The point is: While some difference in pay might be justifiable (to compensate for the lack of income during the time it took highly skilled laborers to get their skill and as part of a system of incentives to encourage people to pursue these careers), the magnitude of that difference in most places is very much not!

A full-time job should pay a wage from which a family can live. Doesn’t have to be great and doesn’t have to come with yearly vacations abroad, but it has to be enough for food, shelter, transportation and some entertainment. The problem is that we are very much not at that point any more. (Though this even extends to a lot of jobs that do require year-long training…)