Bottom line, you first need to appreciate the opportunity of even getting an interview and when it starts speak truth, speak slow and be real.
Furthermore, I wouldn't be surprised if this was a planted post based on real thoughts and observations designed to get feedback. YC is clever that way. Part of the process is meant to be chaos in my opinion, at least the interview. If you cannot handle 15 minutes of Hell's Combinator, what will happen when your company faces significant challenges that could determine the life of your business? That is not to say YC knows it needs and is trying to get better. It is so much more than a snapshot. Certain situations require certain action and are designed to get a certain type of result.