Many questions posted on the site are duplicates, but sometimes it's not easy to identify the most perfect match. Frequently, for instance, there is an older question, itself a closed duplicate, that has some excellent answers (and, of course, the close window links to further duplicates) but it seems sub-optimal to close by reference to another closed post. Of course one can add links to other duplicates in the comments, but that doesn't seem great either (comments being highly impermanent).
As a matter of global Stack Exchange policy, users with relevant gold tag privileges are able to edit the duplicate window and can use this ability to add multiple duplicates (see this question). I wonder why that ability is so restricted?
For excellent reasons, in my view, we are increasingly encouraged to close duplicate posts and I think it would be good to do so in the best, most informative way possible.
Any chance of opening the edit powers up more broadly? Or, is there another approach to a similar result?