I'm guessing part of the reason may be that the Tolkien tags are a giant mess: I nommed Elrond under "Lord of the Rings -- JRR Tolkien;" someone else nommed him under all media types and a third person nommed him under the Silm. (I peeked at FFA for once in my life and saw that. I'm blaming morbid curiosity for going there.) I nommed Maglor and saw a nonnie also did; I still don't know how that was possible. And those are just the examples I know about.

I might have a solution for the bookverse side for exchange tag wrangling, but I don't know if the mod's interested in hearing about it now or later.