Pretty simple explanation right here: https://i.redd.it/7h1mwj3gcjd61.png
I do my software engineering work in the middle of the night, while I'd happily work during the day for labor. Why not? Hard work keeps the body young. 2000 hours and licensing barriers is why not. There's no entry level apprenticeships available. There is no on the job training available. Even if someone is an autodidact the shortage is a given when the hiring requires unnecessary experience.