Earlier quoted context omitted.
Reposts is one thing, but the person I replied to was gatekeeping the discussion. If the post is flagged, that does the job of solving that for us, but telling people not to start a discussion on a subject "because we've been there before" is S tier gatekeeping, and that's what I was opposing.
There are some HN commenters that try to do this on a regular basis, either trying to prevent discussion, redirect it or get it moved to another thread For example, https://news.ycombinator.com/user?id=ChrisArchitect It's quite strange to submit something that obviously isn't going to get any discussion, this is a _news aggregator_ not a "discussion aggregator", only to see the same commenter repeatedly leave some as…
I'd argue, as I think you are, that the repost rule doesn't even really apply here cause as you say, it's not a dupe link, AND it adds commentary.