Because its a total waste of money -- I'd be hiring someone who does not posess the requisite skills to do the base level job. My job is to create software solutions for the company by using my skills, and lead a team of engineers to produce a better solution. The role I hire a junior engineer for is the same: a much lower requisite skill level, yes, but skill nonetheless. I am not in the business of education -- that is literally what educators like Austen are for.

While the time spent teaching a blank slate how to be an engineer might benefit the person, it is literally throwing money away from the perspective of the company because it's not what I was hired to do.