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The only thing a PhD in anything qualifies you to do at the end of it all is to become a University Professor. There is otherwise nothing you are qualified to do after having received a college diploma or a university degree.
Trade school on the other hand, qualifies you to do something very specific as you've pointed out with your son's experience.
Trade school on the other hand, qualifies you to do something very specific as you've pointed out with your son's experience.