This is definitely true but it doesn't hurt to ask. I've asked every time and gotten some really useful responses. When I was young I interviewed at Microsoft

This is definitely true but it doesn't hurt to ask. I've asked every time and gotten some really useful responses. When I was young I interviewed at Microsoft and was rejected. I asked the recruiter for feedback. She talked me through some of the feedback from the interviewers and gave me advice for the future. It was really helpful.