I was reviewing an edit (by an anonymous person), that they removed a statement from a post, saying that this was incorrect. I rejected the edit, and left the comment that they should downvote and leave a comment rather than wholesale removing content.
Then I thought that might be a good clarification to be made- the difference between a 'good' edit and something that should fall into one system or another. Perhaps this is already spelled out, but a cursory search didn't bring up this specific issue.