@benpate Yes, this is a description of what Streams does with some minor additions of my own. It is not officially produced by the Working Group but they are aware of this FEP and we are trying to figure out how to arrive on a single standard.
Conversation Containers help bridge the gap between the "threadiverse" (which mostly uses FEP-1b12) and the micro-blogging space, where this mechanism can be used to implement reply controls and followers-only posts.