> However, in maintaining its simplicity, many new features and behaviors added over the years on Hacker News are not fully documented other than the occasional comments from staff.

Ahahaha what?!? That is the opposite of "simplicity". Instead of exposing the functionality, it is hidden away but still active, and to know how it works you have to hunt through potentially thousands of comments, which might already have been obsoleted by later comments.

What's wrong with just having a help page? Or a sitemap? Sitemaps are pretty old school, they should be right up HN's alley, no?