I have noticed several instances (and there have been a few flags) where the question says quite clearly something like:
I am looking for references about [some topic]. I'm not really interested in anecdotes or opinions; I am looking for data or studies.
And yet the top answer (often quite upvoted) is:
Well, I don't have any references, but I've observed this too. One time, there was an [anecdote].... It seems to me that [opinion and speculation]....
To me, this is particularly annoying when the asker states that they are an "expert" (e.g., the reference request is based on an observation from many years of teaching) and the reply is "common sense" (e.g., a student's opinion or reasoning).
Relying on downvotes to handle these answers does not seem to be working (particularly on popular questions where far more people have the upvote privilege than the downvote privilege). And to be fair, often there are no studies that anyone is aware of, and so if we delete all answers that don't contain solid references, the question will go unanswered.
So: I am just trying to get a sense for how people feel about this. Is this a problem/annoyance/sub-optimal behavior that we should move towards discouraging or disallowing? Or is it fine and there is nothing to see here? I'll add some voting options to make this slightly more concrete, but feel free to add your thoughts in an answer.