Is there a reason why questions already marked as duplicates stick around forever? Why aren't they automatically deleted after a month of inactivity or some other, similar, time-frame?

Edit: I just realized that my question is a duplicate of this one. Should this one be deleted?;-)


In many cases, due to their different phrasing, they help users to find an answer, as it can be read on StackExchange Meta:

Should duplicates be deleted?

In general, no: most duplicates stay around. Having multiple copies of the same question with different wording is useful as search fodder, because people looking for an answer may use different wording too. Duplicates that are word-for-word copies or that are so poorly written that they are not useful may be deleted by users with sufficient privilege.

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