I would like to reiterate a point I brought up to a semi-related question here:
…I have seen many cases of users (often in chat, occasionally in comments) giving fully detailed — and valid — answers to extant questions, but refraining from actually writing a proper answer just because they don't have the references available.
This is not necessarily limited to answers that lack references; I have seen similar behaviour for answers that answer most (but not all) of the question itself.
The problem is, neither chat nor comments are designed for answers — that's what the answer field is for — and answers placed therein are unnecessarily crippled. They are harder to search, nigh-impossible to edit, cannot be properly voted on, and even if they could be they are not sorted. And, right or wrong, they have zero effect on the posters reputation. They are, quite frankly, horrible places to put answers.
How, then, should we be dealing with these "half-answers"; those answers which may still be useful — not to mention correct — but lack enough "meat" (either in the opinion of the site's community, or the poster himself) to stand alone as a proper answer?