Why do some people answer in comments?
(Despite the similar title, I don't think this is a duplicate of this question.)
I often encounter the following situation: high-rep user
A comments on
B's question with something which is actually an answer. It is not uncommon then for
B or other users to ask
A to re-post their comment as an answer, and
A usually accepts.
However, I think
A's behavior should be avoided from the beginning. While I appreciate the noble gesture of not asking for a rep increase (?), such a habit often results, for instance, in cluttering the Unanswered tab with actually answered questions. You may argue this is not as important as the converse (answers should really answer questions), but still…
Question: Should this behavior be discouraged more seriously in official policies/FAQs?
One could recommend a community wiki answer instead of a comment, in all those situations where you have an answer for which you don't want to take credit, for whatever reason.