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

Daily discussion thread

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.