This all requires that the interviewer be willing to interact deeply with the candidate. Our profession has a (well deserved, I think) reputation for having a high percentage of people who really don't like interacting with others on a peer level.
Is it likely that a large part of the problem is that we have people doing interviews who really shouldn't be? I mean, if your typical response to talking to another technical person is immediately to try to one-up them, then you're going to be a really shitty interviewer. And that's exactly the personality type I see being described over and over in these anecdotes.