So, basically, you're saying, "because Blizzard didn't say they don't use black dragon magic, therefore they use black dragon magic"? Okay, let's play that game:
• By your logic, evokers can cast blood magic, because Blizzard never said they can't use blood magic.
• By your logic, evokers can shapeshift into bears, because Blizzard never said they can't shapeshift into bears.
• By your logic, evokers can dual-wield two-handed swords, because Blizzard never said they can't dual-wield two-handed swords.
• And so on and on.
You don't seem to know what 'objectively' means, if that's the case.Then you're splitting hairs. Nothing's changed, you're just regurgitating the same objectively wrong statements.