Originally Posted by
Gaidax
That's in line of people saying same about Demon Hunters - heard of Warlocks? Demo specially? Really this is no argument and you, as Warlock, should know it.
Death Knights and Necromancers are completely different archetypes in both lore and reality on the ground. Heck you already have similar case of Priests and Paladins, existence of one does not invalidate another and it's literally same case - one is spellcaster another is fighter, even if they draw from the same source of power and even have similarities in some ways.
That's why, for example - Affliction or Unholy DK are in no way blocking Necromancer, simply because they may be getting power from same sources Necromancer does thematically, but the application can be vastly different.