Remember On the Job Training, those days that allowed people without direct schooling in a trade could still get a skill and a job. If you wanted to be a welder, auto-body painter, machinist, plumber, etc. all you had to do accept a lower wage or no wage and employers allowed you to learn a trade.
Businesses used this system of training to find and develop new employees. Today Government regulations and blood sucking lawyers prevent the employers from using this job building system.