If there is anything that Blizzard has learned over the past few years, it is to avoid making absolute statements. They were pretty adamant about certain things (PVE-->PVP transfers, for example) that they wound up changing later, and they realized at some point that pretty much anything in the game can change. So they try to add disclaimers more often.
But it just reinforces what I said, that Blizzard is fine with multiboxing and the current objections to it are irrelevant. Stuff like "it is against the TOS" or "it's automation because I said so" or "it's one player with 5x the power and that's cheating" and similar arguments won't work. If Blizzard ever bans it, it will be for some other reason. Personally, I don't see it happening because Blizzard seemed to have covered every possible complaint. If there was some new and valid reason against it, someone would've stumbled onto it already, and that hasn't happened.
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