Originally Posted by
KOUNTERPARTS
The whole basis of Mag'har orcs is that they are uncorrupted from fel magic. The term "Mag'har" means "uncorrupted" in Orcish language. When orcs dabbled in fel magic, they became corrupted and turned green. Those who didn't and remained uncorrupted named themselves Mag'har. Mag'har orcs becoming warlocks defeats the purpose of them being a separate sect of orcs altogether, let alone a separate playable race apart from regular playable orcs.
Same goes with draenei and Lightforged draenei, as the corrupted eredar race (draenei means "exiled ones" in their language, and wait for it-- are also uncorrupted from fel maigc) became the Man'ari Eredar that are one of the foundation races of the Burning Legion.
There is a pattern here clearly.
Also all of this is very easy for you to find out on your own.
EDIT: There are some race/class combinations that Blizzard could definitely just bite the bullet on and implement that have no lore significance whatsoever... like Tauren rogues. Lore should still matter.