Earlier quoted context omitted.
> Is it true that people actually don't care about keeping ownership over their content? You comment here. Isn't that basically the same thing? What are comments if not for mini-blog posts sometimes.
Hacker News comments don't require the blood, sweat, and tears involved in writing a 1,000-word well-edited essay. Additionally, Hacker News comments aren't used by the owning website for potential profit. (Y Combinator as a brand is likely hurt by HN comments anyways)
Comments are the price some websites pay to encourage higher levels of engagement, and the high level of engagement here on HackerNews makes it a more valuable resource to its readers (more submissions, more voting, and sometimes informed comments from the community) and thus it has a halo effect on YCombinator. Thus the comments in the grand scheme of things are surely a net positive.
Reddit and YouTube are built in part on comment driven engagement even if a large majority of the comments are poor.