For my part at least that wouldn't really fit the requirement. Type of text ("book") and identity of fandom are two different things. It would be very useful to still be able to search by type of text.
Litfic might be considered a fandom by some but I don't think it's overarching enough as an identity to play the role that you're hoping to fit it into here.
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Litfic might be considered a fandom by some but I don't think it's overarching enough as an identity to play the role that you're hoping to fit it into here.