Agreed with everything you say here, except I'd add one thing: It's not just for "average folks" either. From what I understand, there used to be a YC Wiki that

Agreed with everything you say here, except I'd add one thing: It's not just for "average folks" either. From what I understand, there used to be a YC Wiki that was used actively among founders in each batch to share information with each other. This previous batch, nobody touched the Wiki after the first week. Everyone just used the YC Opzi. This was not out of loyalty: I've grit my teeth and used some raw, unpolished products of other YC companies, and this wasn't that. The Opzi was just much, much more convenient. No time was wasted formatting the page or organizing sub-topic pages. It was much easier to discover interesting content and get notified when interesting questions were answered, which was more often because the Q&A format does a better job of encouraging people to answer unanswered questions than a Wiki.