One of the few things a ♦ moderator can do that regular users can't is add post notices to questions and answers. For reference, the current set of notifications are:
This post does not cite any references or sources. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.
Post is related to a rapidly changing event.
We're looking for long answers that provide some explanation and context. Don't just give a one-line answer: please explain why you're recommending it as a solution. Answers that don't explain anything will be deleted. See Good Subjective, Bad Subjective for more information.
I've never had a need for the middle one, but I suppose there could be some discovery of a manuscript or whatnot that might get asked about. I'm often tempted to slap the other two on posts fairly regularly. Answers from new users are pretty likely to fall under the domain of "insufficient explanation" if they are longish and under "citation needed" if shorter.
Personally, I think moderators should use these notices often in tandem with more specific comments. But I can see scenarios where these notices could drive away new users.
What do y'all think? Should we be liberal or conservative with post notices? Why?