That should be fine, because they are distinct articles on their own. I think a single user would be less likely to publish their incrementally growing book one in a way that clutters the feed, or the design can incentivize that behavior. Def would like to avoid the "nostr plays" type of cluttering.

Viral publications could unravel something like this:

1)user posts 🔥 article
2) many users share - nothing different
3) many users edit, fork and integrate the existing article. 

But because these kinds are slower moving than kind1, i don't expect it to be a huge problem considering what is already being delt with. 

Even better is when specialized clients connected to themed relays/communities use this. Members of that community can decide on best practices for posting and writing.