Yeah I love the Defias, and I love the idea of corrupt nobles in Stormwind. Their desire to see Stormwind burn would’ve been good motivation to join the Horde, we’ve already seen them work alongside goblins and ogres too
And even in Classic they used a thin human model. I know nothing’s stopping them from worshipping the light, but we haven’t exactly seen any Defias paladins running around (that I know of at least)
I like the idea of Alterac humans more, anyway