We should make an effort to reduce duplicate feed items. For example if you're looking at doc A and it has children docs A1 and A2. When A2 introduces a citation on A1, there are multiple feed items generated. (A2 was edited, and A1 has a new citation). Maybe in cases like this we want to intelligently reduce the number of feed items that are shown from A. But only if we have an intelligent way to combine or summarize them.
