Obviously I know it's allowed (at least at the moment), that's why I'm politely asking to consider a change. Multiboxers in battlegrounds are also technically premades, and one of the most disruptive scenario premades can create, and unlike regular premades they would be very easy to regulate.
And I don't know why you feel like you have to reply to defend multiboxing, but I can say you're not seeing the whole picture:
It's not just about 5 chars pvping stacked together (which IS automation, unless somebody is physically using 5 keyboards at the same time), but also about the power that is given to a single person to be able to unfairly influence games, favorably but also unfavorably for its own team.
I'll give an example:
Some player is new at the game or very undergeared or decides to play in a way that goes against his own team, or more than one thing together.
For example, not playing for objectives and pvping pointlessly (which made its own team lose) is the last case I've seen.
Now, on a team of say 10 or 15, if 1 player did one of those things it would not be overwhelmingly disruptive.
It's completely different if that player is now controlling 5 characters, which is half or 1/3 of the team.
It means the other half or the other 2/3 are completely affected by what that single player decides to do, how skilled and geared he is.
In other words, multiboxing in BG also unfairly amplifies the potential of disruption one player can cause to a team, whether it's is own team or the other team.
Regular premades are not like that either, they may coordinate but they are different people with different ideas, which may or may not agree. It's not one player deciding for 5 characters like it's the case for multiboxing. Also they're not able to spam a skill on the same instant, because they don't automate what the other characters do.
So I don't see the reason why a single player should control 5 characters and create a negative experience for several people (either own or the other team), decreasing the quality of BG pvp.