I used to flag duplicates from the new page, but realized it goes nowhere. Maybe a different flag to downgrade dupes?
This is definitely true of mainstream social media, but I don't think it's that bad on HN. Based on the list of duplicates, this has been posted 13 times in 12 years, that's really not that bad. Things don't live on the front-page that long, someone reasonably could have missed it every time. If people are engaging with the post, what's the problem?
Dang has a pretty good list of links that keep showing up every 90-180 days on a continual basis (e.g. "The Story of Mel")
This is hardly news, even if it prompts discussion, most of it is repeating the same discussion from all the previous discussions