I agree. I don't have much time for the blog or the books or whatever else t.v shows/ films etc. put out there because I'd rather they wrote better scripts rather than force their fans to seek out other outlets to get better clarity on what's supposed to be going on on the show/ film, whatever. But if the shows put them out there I assume, beyond being a cynical cash-in, that these things are supposed to be an addendum to the viewing experience and therefore another facet of canon. After all if the show doesn't want the audience to view them as connected to the show then the simple solution is not to produce them then there wouldn't be any confusion.