Because the way you’re talking you’ve sent in I don’t know how many tickets. It’s not that they don’t know this or that. It’s because they cannot give explicit information. Just like with your main account being sanctioned. Some rules must remain fluid to give Blizzard the room to keep up with the ever-changing landscape of what people will do.
You seem to be under the delusion that if you just get the right person you’ll get someone to say something to the tune of what you want. It was explained in your other thread and it’s been explained here.
Blizzard will not give a hard yes or hard no to any sort of set-up, software, hardware - any of it. They never have, likely never will. To do so not only gives players wiggle room to try and arm-chair lawyer their way out of something and it gives illegal players and botters the same.
Anything that streamlines multiboxing in any fashion is against the rules. If you have to ask “Is this permissible?” It likely is not and should be avoided. Play the game the way it’s meant to be played. There is no need for some convoluted set-up. You play on your system, your buddy plays on theirs.
Adding references to Blues saying what we’ve been saying.: