There are some old questions that are still basically unsolved where new users come along in search for a solution and start posting answers with additional problem descriptions. The users are new and the only way they can contribute to the search for an solution is by posting "answers" because they don't have enough rep for anything else.
For example in this question there are several answer like this, one from today. If this were to be posted as a new question it would be an exact duplicate. The new information from the answers should probably be edited into the original question or be a comment. But even if somebody would come along and edit it into the original question, not many people would see it (especially since the question already has an accepted answer). The problem will most probably stay unresolved.
What should one recommend to a user who posts such a reply asking for a solution? Post it as a new question despite it being a dupe?