Omg you are clearly blinded..
Saying we already have BE is not saying that HE aren't there in the alliance, do you understand that?
And while you point lore and gameplay reasons... well, i know that you don't care but there's tons of suggestion to modify HE to be different and still resembling a HE and lore reasons against HE are not nearly reachable...
The answers Ion gave twice got debunked many times, is not the answer i want to hear, is the answer it must be given, because giving reasons that simply do not have any weight is anything but useful.
I repeat, this is going to end when Blizzard do something about it, such as wiping HE population, transforming them, add them to the alliance playable options, or Alleria recruit them in their VE forces throught Vereesa (and no, this last one was not done, study void magic is not infuse yourself with it).