If I take a random one on the front page right now, "The square roots of all evil", it doesn't describe at all its content. Yet if I flagged it, I know it wouldn't be renamed.

Another example is an earlier post that got a lot of traction: "The correct amount of ads is zero". This is borderline misrepresentative to be fair, but even being lenient on that aspect, it is not at all helping me understand what I will be reading if I decide to click on this article.

Those articles thrives on HN because even if it's not exactly clickbaity, the titles have a "shock factor" that makes people click on them.