I think we probably want to draw the line where blizzard draws it, namely where the experience impacts other players. Macro workarounds are working within the system in a way that doesn't harm the experience of other players (albeit in a way that is obviously not intended).

Queueing multiple parties at the same time, the same week that blizzard has said "we don't like people queuing with groups of more than five" in regular battlegrounds is obviously still impacting the playtime of other players in the way that was just banned using addons. I guess I see that as the difference.