The rules states that vampires, and all the subspecies, feed upon the very Essence of their prey. Since your Essence score influences your Magic and Resonance attributes, and loosing Essence by any means mean that your Magic or Resonance gets lowered definitively unless you spend XP, since it doesn't regenerate naturally, one would expect magic-users to be very wary of vampires-type, or outright hunt them as a precaution. But I couldn't find anything definitive on the various supplements that I've read.
So, what is the official in-universe stance of magic-users (I include metasapients with natural magical abilities in this term, even if it's just dual-natured for example) towards vampire and their subspecies?