I think it's reasonable but I think it's overkill. What I eventually plan to do is to have a related area popup if there's a post with some cross over which should cover this case if it's implemented well. I've only noticed the discussion with link thing twice, maybe three times.

k00b

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saloon

Duplicate prevention steps are working, at least for Youtube where one is the full youtube link and the next is the shortened youtu.be (and vice-versa).  So that's good.

Another duplicate prevention I've been thinking of is to list as dupe candidates either a Description post that had that URL in the description, or a reply in any post that includes that URL.   So if I'm posting a link for an article that's already been shared in another post, I might just go visit that post first, to see what is discussed.  I can still post the article even though it was in some other post on SN, ... but maybe I hadn't known about that other post existing.

Reasonable? (and wanted?)   If so, I can go add this as a feature request in Github.