It has been overwhelmingly unbalanced in favor of Alliance for too long. I don’t recall it being a big issue in BFA, but Shadowlands on, EVERY single new patch or ex-pack release AND much of the rest of the time, it is at least 2-3x the number of Alliance.
We fight hard, but you cannot overtake 2-3x your numbers especially if are not organized, as WM is usually not.