My problem with having too many boards is that it decentralizes posting and culture.

Part of the fun of an imageboard is the melting pot of topics brought about by a melting pot of different users. However, when you over-segregate conversation you lose a lot of the friction that a meme, or an inside joke or a memorable moment can spark from.

If someone wants to talk about, for example, their Barbie collectibles, i think it's best that they do it on /b/, where the preaching will not only be directed to the choir, but also to the people who are there because of videogames, anime, travel threads, technology, etc