I dislike that. IMO, if the content cannot stand on its own, it did not need to be posted. A comment that adds something to it, to initiate a discussion, is fine. But a comment that just says what that post is? That is neither interesting nor engaging.

Such comments also encourage the idea that people "own" the threads they start. I've seen people get mad when people take the conversation in a direction they did not want, or add instructions telling people what to talk about and putting constraints around discussion. Such things stifle interesting conversation.

So I land heavily the opposite direction. Just post, and leave it at that. If the community finds it interesting, discussion will ensue.

Now, Show HNs are their own thing. An initial explanation is absolutely appropriate for a show HN. But it should be part of the post, not a comment.

Probably because posting summaries of the submission is discouraged by the HN moderators, e.g. https://news.ycombinator.com/item?id=44946681 or https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu...

I suspect it was one of the content review bots. In my first Show HN post, I handwrote the comment, but using a bulleted list style suggested by an AI agent, and that got flagged. I reached out to the mods, and they told me to switch to prose, which passed muster.