Are 'Yes' and 'No' answers to questions (that ask only for a yes or no answer, even if that's a bad type of questions according to the SE model) without any explanations acceptable?
Whether or not something is (technically) a yes/no question is quite often nothing but a stylistic choice. This choice, when made, might not be optimal for the medium, but I still think we should try to minimize "literal" answers in such cases.
Could you give me some references? Yes!
Is this argument valid? No!
Is this or something related known? Yes!
I actually do believe in educating users to make quite explicit what they expect as an answer. However, they way to do this is not via giving yes/no answers, in any case not as answer-posts.
Even if the question solicits a yes/no answer, the answerer should be able to generate something of substance to add to their response of yes/no. For instance, take the following question on a Laplace transform:
The OP asked if they were doing it correctly. Well the answer is yes, but I was to able to add something of value. If someone is really just going to write yes/no, it might as well be a comment.