"I can no longer sit back and allow Communist infiltration, Communist indoctrination, Communist subversion and the international Communist conspiracy to sap and impurify all of our precious bodily fluids. "
- General Jack D. Ripper.
Being a warlock isn't the same as being corrupted by the Fel.
Though I always think the more customisation the better.
Such as Blood Elves would never want to ever be allies with a race that destroyed their borders and killed many of their people?
We got to be more self aware bias. Many of the races that are current allies have a lot of reasons to be enemies instead, but their context has changed. To pretend that a group of Eredar, which would obviously have their own context, could *never* be able to work together with orcs, is hyperbolic.
You can even make the case that because the Orcs were manipulated they can actually understand better understand the Eredar's own manipulation, and that's not even counting more self serving reasons.
We should ask for better contextualization rather than outright claim anything impossible, but first we *have* to be aware of our own biases.