^^ Strongly agree! Though I'm not sure I would call it a problem per-se. Employers do want people who can contribute right away, but I'm not sure all do a good job of "priming" the pump. I know the places I've worked at did not always do a good job of finding interns, etc. to try and pre-populate their future applicant pool.
It is difficult to find "plug-and-play" engineers right out of college. This really isn't isolated to the racing industry, though this forum is potentially more sensitive to it. Before returning back to school full time, I spent 5 years working as a test designer and thermal fluids modeler in the power generation industry. With the exception of myself and one or two others who had interned for 2+ years before starting full time and were willing to work 80+ hour weeks (at a significantly higher salary than any pro racing job BTW), most starting engineers in the groups I worked in failed and either washed out quickly or settled for marginal performance. These were not unintelligent or ill-educated people either; they just had no professional experience and no one had enough time to devote to training them. The expectation was that new employees would come in and begin contributing immediately (not sure who came up with that one, I still can't understand how that is ever a reasonable expectation).
In any case, the moral of the story is that like exFSAE said, professional experience is exceedingly important.