this is so interesting! I had no idea about werewolves, it’s really surprising. Maybe because it’s such a niche, like when you search werewolves stories you won’t end up on something random? Idk but fanfiction has multiple genres within fanfiction itself, and stories goes into all directions: romance, fantasy, etc. So you start reading and often realize it’s not what you wanted, ie you wanted a romance fanfic and you got a romance-fantasy fanfic but you hate fantasy? So you stop reading. That might not be the case for werewolves?
Historical fiction having a high completion rate isn’t that surprising to me. Maybe cause most historical fictions are well-though and somewhat researched because historical means research in some way? Like authors are really committed to their historical fiction. So when you enjoy reading historical, you tend to find more quality stuff? IDK.