Was thinking a little more just now and somethings more specific came to mind.

Is there already the possibility to construct a collapsible nested post? E.g. a person could write on a high level of abstraction and offer more fine-grained descriptions, definitions of terms, additional context etc. in an area that is initially collapsed but which the reader can choose to show.

It would also be nice if a post could grow organically in this way. E.g. when an author notices area's where there seems to occur frequent misunderstanding he can add these collapsible blocks. Or when he comes across or thinks of some great example or illustration or otherwise relevant material he can add that as a collapsible block. It would also be cool if authors could construct their own category systems or tag systems to be used to label various kinds of blocks. E.g. I could label a block as "example", "illustration", "potential counter-example", "relevant quote", "relevant meme", "would-be falsification of the idea", "definition", or whatever else.

All of this could be done in an append-only manner. I like the fact that the past cannot be changed. But I would like more ways to add more context to existing posts. It seems to me that could be done in a way (e.g. with timestamps and maybe hash-trees) that leaves no confusion about what is new and what is old.