As I said, the point of cross-realm serves other things than JUST 3's. It is pretty clear. Unless you're wanting me to make a list as to what cross-realm and clustering does to benefit the game? Because that's something you should able to look up on your own.
I said that wasn't the purpose of cross-realm. That is not the same as saying brackets won't be merged. That distinction is important because what you're saying I said is not what I said.