Getting feedback after 'failing' has been a very rare animal in my experience. Those few occasions where I have had some it's been useless anyway, can't say it's had a real impact on me.

One of my all time favourites was getting a hit for an interview twice but with a few years in between. Failed both times, not a clue why. Lo and behold a few months later a recruiter wanted to put me forward again and I declined due to the lack of feedback. He said it was probably the recruiter not the employer. Unfortunate that, he worked for the same ones....