I haven't used it yet, but it seems like there are many good design ideas for streams of updates in @tg's post about Current. One thing I realized after reading is how some of the ideas synthesize techniques/kludges I've been using in other tools.
For example using the "enable notifications" feature in Mastodon as a way to extend the "half life" of posts from particular accounts. I have to dip into a separate stream to see them though. Being able to let them sit in the same stream, with more control on how long they stay there seems like it would be a miracle.
In my FreshRSS feed reader I have partitioned off some blogs into a "people" category, because they are more like voices. Since RSS feeds come from such different sources, and operate on such different cadences I think it makes sense to be able to notice "voices" in the stream interface.
And Current's idea of not letting prolific accounts overwhelm the stream, reminds me of how boosted/reshared posts in @phanpy splay out horizontally to prevent them from overwhelming the vertical stream of posts that were actually composed by the sender.