And those workers don't want to do those jobs, for that $, anyway. A friend of mine with a farm in Quebec, Canada says even if you can find folks to do the work and pay them well, they often aren't reliable. Better all round to use temporary workers
In the same way that only a minority of people have an aptitude for work consisting of an 8-hour hard-focused (e.g.) mathematical workout every day.
The difference is that the former tends to come with a sub-cultural attitude of "people who can't/won't are Lazy", which is unfortunate and misguided, in the very same manner that a "people who can't/won't do maths all day are Stupid" view would be.