There are generally more complaints on the forums about multibox farming characters than PvP.
I don’t think I’ve ever seen 30 accounts in one BG, however after farming my rank 4 PvP essence I’ve barely set foot in another battleground this expansion. Multiboxers were a rare sight during that slog.
I am not a fan of multiboxing myself and I wouldn’t shed a tear if it was no longer allowed. However Blizzard’s stance is that it’s no different to a coordinated group in PvP or other activities.
I don’t have an issue with people complaining, I dislike that people can’t constructively stick to one topic, so we end up with this endless cycle. I get the impression I’m not the only one who would love to see them all properly merged into one:-