Moderators can add post notices for posts that are unsourced, refer to current events, or are insufficiently explained. (This last links to "good subjective, bad subjective".) On a healthy site, about how often should we see posts with these notices (as a fraction of the overall post pool)? Anecdotally, some mods use them "a lot" and others have never used them, so I'd like to understand what the SE norms are (if any exist). This blog post from 2011, from when the feature was introduced, suggests (penultimate paragraph) that it should be rare. Is that how it worked out?
I'm not talking about locks, but about the other kinds of notices (the ones that people could correct via editing).