We've had an anime board in one form or another at many points in the past ( https://wiki.heyuri.net/index.php?title=Heyuri#Former ), but those boards were seldom used and weren't any different from Off-Topic in terms of the kinds of posts you could expect

So for the sake of not needlessly splitting the site's users/activity up and making moderation more of a hassle than it needed to be, they were merged with Off-Topic