There are some questions that I found which I could answer by sharing links to another question. These questions have no answers and the solution is present in comments, which I feel is not user friendly as most of the basic users don't go through comments. On finding 0 answers displayed they keep searching or they post a new question leading to more duplicates.
I would suggest one should be allowed to post at least one answer and flag the post to be closed so as duplicates may be avoided. This will help a lot of answer seekers.
And is flagging such questions for closing a good thing to do?