ActivityPub specification seems to support updating existing objects.
It would be helpful to add edit feature to existing notes.
This is planned, and there's already basic support to process
Updatefrom other instances.
Handling the addressing of update activity is a bit tricky, and I haven't got time yet to work on it, but it will definitely end up being implemented.
I don't know if this is the right place, but I'll give it a shot:
It would be a nice feature to be able to work on a note/article and being able to save it without publishing it, yet.
Does that fit here? Having a place to start writing, add to it, work on it, save it to go on working on it later - all without publishing.
Later at some point it should be possible to hit the publish button.
I think that's another discussion, it would be "draft support".
I am not sure it will be implemented, I will have to give it some more thoughts. I see how it can be useful, but I want to keep the number of features small/only essential stuff (and there's already a lot of stuff in my todo list to stabilize existing features).