1) Yes, events at the top. ISBN, URI, Podcast ids... can all be part of events, but they are not the addressable entity.

Same problem for when you're looking for all articles, replies, etc... on a Bach concerto. Wikis are the solution.

The best wiki entry (for you) on that concerto will aggregate everything around it (tailored to certain niche) and have all the identifiers (event and non-nostr) in there.

And the best Wiki app (for you) will aggregate the best Wiki entries (for you).

2) I think :90percent: of general Rating systems are useless on a protocol where you have replies, zaps, discussions, articles, ... on the thing you're looking to judge/compare.

If you want to know if Jane Eyre is something for you, I think we have better options:

A) Personalized summaries of the data around it.

(data that people are publish regardless of general apecs trying to make them rate stuff according to their standards).

B) Specialized Comparing apps (that use whatever metrics they find useful for the niche they're catering to)

C) Is Jane Eyre even a thing in my network?