I mean could it be clarified further? Ya. I don’t personally think it needs to be. There’s a bit of common sense we could apply here, combined with a little bit of context and logic.

The “Not A Bug” list is typically in response to people reporting something they think is wrong. Did you see Arcane Missiles do damage, and somehow not put you in combat based on that damage? Did you hear anyone else discuss that in the many videos and posts about bugs here? Or is it far more likely and logical that this is based on someone thinking the modern WoW/Private server behavior of Arcane Missiles putting you in combat before damage is registered was supposed to be the intended behavior, but they were wrong?

And lastly, we certainly never had Mages easily soloing any mob in the game or the beta ,because Arcane Missiles never put them in combat so the mob never attacks them. Nor did they stand around doing essentially nothing to the out-of-combat mob, who would actually probably just keep regenerating since the NPC never enter combat either. Unless we are thinking this is some sort of way of forcing an NPC into a Bloodlust scenario where they are in combat with themselves (warrior ability that traded life for rage put you in combat).

There’s just so many weird things that would have come up surrounding that type of behavior if it were ever the case, either in the Classic beta or in 2004-2006. None of those conversations have actually come up though.