Isn't the Battle.net chat a separate system? I've witnessed several times that the chat was down on login. There's also the fact that one may completely opt out of Battle.net chat on the account level. (I think?) All in all it doesn't seem like a very reliable solution, but if it's the only way.. meh. All these cvars always seemed a bit clunky to me, as well. I hope they'll implement a proper API for it, a la GetServerRegion().
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