Hmm sure, but companies that don't give canned responses are liable for lawsuits. A teacher's explanation can be wrong or misleading. I've also had some of teachers refuse to explain the alleged errors in my work, and I've even had to argue with teachers that they are wrong and I'm right.

I suppose if you went to a great school and then to some shitty interviews, you'd like the school more than the interviews, and vice versa. The difference however is that a teacher is only motivated by their altruism to help you, whereas a company has actual financial motivation to find good people during the interview.