I do not think you are actually addressing the point he made. I have a lifelong friend that got a welding certificate you of high school, but delivers for FedEx. He enjoys welding, thought he would do it for a living, but it is really worthless training. However, I would never say that welding is a worthless skill or training.I don't think anybody regrets getting a vo tech welding certificate even if they don't use it for a primary source of income.
It comes in handy to an employer that you are willing to learn outside of the box and your more well rounded in the education of the blue collar worker even if one does have a college degree. Plus, you get to use that skill to build cool stuff a home.
I had a whole lot more respect for the engineers I worked with that came off the farm where they worked with their hands before they worked with a computer.