[quote=@EliteCommander]
<Snipped quote by Freeshooter92>

It would be, if that were actually the case. 
[/quote]

What's the one thing that defends against Psychomancy? A thing that only mages can learn that requires specialized schooling that takes time away from actually learning how to use your blood. And, additionally, Psychomancers are the best at it, naturally, so a Psychomancer is the best counter to a Psychomancer.