Previously, in order to explain the benefits of (certain limited kinds of) duplication on Stack Exchange sites, I've seen a blog.stackoverflow blogpost with the words "Dr. Strangedupe" in the title.
The post comes up in a search on the new blog, but "can't find the page I'm looking for."
Can we please bring this post back? I'd love to link to it when commenting on duplicates, to reassure the questioner that there is value in not deleting their question because of search terms, but the blog post explained it a lot better than I could in a comment.