I personally feel that in many cases a question really has been answered properly, but people simply doesn't like the answers they get. But there are certainly cases such as you describe. And in those cases, the appropriate remedies already exist.

If a poster feels that his question has gone unanswered, he can always post a response which asks for more detailed information. Since most users are notified when there are responses to their messages, this is a good way to get someone's attention.

Unfulfilled users can even post a new question, hopefully being more specific about the part of the question that hasn't (in their opinion) been addressed. While re-posting the exact same question might not be considered acceptable behavior, it should be okay to put a new perspective on an old question. Within reason.

buckaduck