When detecting a possible duplicate, users (including me) seem to put just a "Possible duplicate" link into the comments, referring to the already existing (and maybe answered) question.
I can't tell why others do it, but I do, because I don't know of other ways to help reducing the dupes and delegate the OP to the dupe (and possible answers).
It feels like the right way to me ("Vote close as duplicate" (3k rep) even automates this kind of comment, afaik), but doesn't doing so result in the same disadvantages as "Link-only answers" have?
I mean, no matter whether a link comes from a "Link-only answer" or a "Possible duplicate comment", deleting the link target will render both useless, right?
With "Link-only answers" it's recommended to add some context to the link, so that such answers still make sense, even if the link target got deleted.
Doesn't that mean, that we need to add context to "Possible duplicate comments" for the same reason? Or to never create "Possible duplicate" comments, but to create "link-with-some-context answers" only?
If not, why are these two cases handled differently?