One of the Chicago Mayoral candidates did an AMA in the recent election and it was pretty abysmal. The good questions were skipped and the other answers were evasive. In that respect, Reddit lacks something an in-person interview can deliver (with a good interviewer) - the ability to push back on a non-answer and not be ignored. You also can't catch someone off guard on Reddit, really - the answers are going to be very carefully curated.