I dig the 'New Answers Posted' banner, as it helps me review what other answers have said and I can stop before I submit something redundant. I think it would be useful if recent edits were included in that feature.
There are times when I feel that a point is being made, but that an important facet could be highlighted and explored a bit further. Granted, sometimes commenting to the author of an answer to prod them on with their explanation is the right approach, but sometimes it is an itch that I feel the need to scratch.
However, if in mid-post I see the banner indicating new answers, I take a moment and check if I am repeating someone else. Unfortunately, if someone has gone in and edited their post, I will not know. I would like to have the chance to review edits at these intervals as well.