This question shows that you're not afraid of critical feedback -- in fact, you welcome it. Interviewers tend to make note of red flags -- whether it be something on your resume or something you said -- to discuss with a colleague following the interview. This question gives them the green light to ask about any of the things that are holding them back from being 100% on board with hiring you.

You get a chance to address concerns face-to-face without being too confrontational. This could be the difference between an offer and a rejection -- or maybe even a higher opening offer.