Can you show me the math behind that please?
I also feel that this is not true.
People who have some kind of “i am good” - mentally probably are and they went horde long time ago. What stays alliance are those who are not willed to pay for their character. Low effort guys stay alliance and you can imagine how a pool of those players play compared to those who are no low effort guys.
Horde is much easier for anything. I would love it to have otherwise, but it’s not.