I think it is worth mentioning something about the way new users should be introduced to the requirement for references. While I don't want to dilute the requirement, I think there is an issue that some users posting their first questions may be discouraged by the tone in which we ask them to provide references.
For an example see the recently posted answer to this question Is the climber's head-lamp backstory for this long-exposure photo feasible? .
I sympathize a little with the user https://skeptics.stackexchange.com/users/13124/sherwood-botsford who provides a reasonably good answer but one lacking references. He argues that the points he is making are "obvious" which I agree with and, I suspect, he feels discouraged at being asked to provide references.
He should provide references, but we might want to be "nice" in asking him to do so as the requirements here can take some getting used to. I worry that, sometimes, the language we use is a little offputting for those not used to it and we might want to veer towards offering advice to relatively new contributors rather than comments that say, more or less, "bugger off you didn't provide any references".
PS I don't think the responses to his answer were particularly bad here, but I do think that some encouragement to play by the rules should have been included rather than the bald "please provide some references" statement.