As you can see, it creates a linked list of notes with a metadata header and only the header shows up in anyone's feed, so you can have really long lists (like a scientific article with sections or a book with chapters). This can then be exported as an ePub or PDF or etc. With a table of contents and a title.

You can also mix your own sections with other people's sections, so that people can zap the original author, or comment on that section and the original author receives feedback.

That sort of thing. It adds hierarchy and creates collections of notes. 

 Would basically turn Amethyst into an e-reader, like Kindle, but with the files on relays.