That would be so much better. The current “buddy system” between Alliance and Horde is stale. Sure, it is convenient in raids and dungeons (Horde is always larger in raids), but having a difference in each faction is so much better.
Have a new class for the Horde and one for the Alliance. Or make the ones that are neutral one specific faction related.
Also just get rid of cross-faction play and admit it was a dumb idea.
Having the Horde and the Alliance with unique classes stand them off the other. And I would love new classes specifically Horde/Alliance - not neutral.
Go play classic and leave us be.
Never happen. That’d require Blizz to actually make larger zones again to accommodate both factions and that’s obviously way too much work.
You think bigger is better, but that isn’t the case.
Spending half your time just getting around large empty spaces is not fun gameplay.
But I am so much more engrossed when I have to inexplicably avoid half the zones because there’s red NPCs even when we’re supposed to be allies.
I’m didn’t say that. I said that’s what it’d require. 
I mean… you do you, I guess.
Please don’t listen to the OP.
I didn’t talk. I type. Unless you hear voices…
If you truly want this, you can go play classic era and roll a horde shaman or alliance paladin.
I hear the screeching of your bad hot take.
Do an exorcism to get those demons off you. Meanwhile, I still would like to see faction specific classes. You can agree to disagree.
I don’t think an exorcism would work on you.
I don’t believe faction specific classes would work in this day and age. Play Classic if that would tickle your fancy.
The funny thing is OP is crying for the authenticity of pure vanilla faction nonsense (which was literally only ever made a thing as a vehicle for pvp) on a toon that could not exist before Cata.