Why is there no Booru-style site for books or fanfics or movies?

IMDB but better, or for books, Archive Of Our Own and Anna's Archive but better. People vote on tags like "Gun porn" and "Slow-motion fight scenes" and "Shakycam fight scenes" and "First-person perspective" and add stuff to groups like "Anti-nihilistic films" and "Horror movies with stupid protagonists" and for books, "First-person perspective" and "Autobiographies by convicted criminals" and "Alternate history where X country won Y war".

Is there something about book or film lovers that would make them oppose such an idea?

Danbooru is an imageboard; would this just be an index of books and movies with metadata but not the actual book or movie? So like IMDb or MyAnimeList but with much better tagging?

This isn't what the forums are for.

I've always low-key been interested in the idea of "Danbooru but for fanfiction" (as a repost archive with a quality control system), but yeah this is completely irrelevant to Danbooru itself. I just thought it'd be cool to share here while the thread is still unlocked (assuming it gets locked eventually).

Not to mention the idea runs into a lot of obstacles.