That paper, if it's the one I'm thinking of, found that a compiler bug found by fuzzing was more likely to be found by a user, than a user found bug was likely to be found by another user. So if fuzzing-found bug reports are bad, user-found bug reports are even less useful.
Another thing to remember is that as blackbox fuzzing became state of the practice, its benefit declined, as the bugs it would find would be found early, by the developers themselves. All testing techniques are self-limiting this way.
I want you to look at the results of jsfunfuzz and tell me the impact of that wasn't profound.
