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Let me give you an analogy. You all probably know how to control a single unit, like zombies. But a player who has only played against the computer and never thought about micro-management in battles, never played online, doesn't know how to do that. And has never seen it. And then he starts playing online and sees a stream where someone is controlling gargoyles with undead. And he doesn't know how to do that, and has never known or seen it. Similarly, he might get upset that this is exploiting a bug, that knowing the algorithm for neutral unit behavior should be banned, and that using more than 2 heroes is only done by cheaters.
And I'll repeat again, using auto-battle is not a bug, it fixes a bug.