As someone who only plays antisocial characters, all I can say is that it's not too hard to get a cross-canon thread. Or at least ten comments over three threads. While I agree that it's not necessary for most players, there are a lot of players out there who don't do any tagging out of their canon. As this is a panfandom game, I find that distasteful. Especially for characters who have no canon-mates, or OCs, or obscure characters, which we have a lot of.