One of the real advantages of the old Askbot site was that when the OP edits the original question, or when a user edits a comment or answer, all contributors were informed about it. Now, edits may remain unnoticed. And that’s bad when you edit an answer to add information to it, to keep all valuable information together. You still have to post a comment to point out that you edited an earlier message.
EDIT in response to @sophi:
I didn’t mean moderating bad language or the like. I mean adding or clarifying content. I don’t see why such edits would have to be hidden. When I ask a question or reply to one, I don’t want to have to visit that thread to see if any such changes were made. I want to get a message when existing posts are edited just as I get messages when new posts are added.