This makes even less sense than the current implementation of vampirism. Not feeding effectively eliminates the curse.
Read it again. Not feeding makes it just a curse, you have regen penalties and can't eat food and the only powers you have are those necessary to help you feed (illusion and drain). Okay, maybe you should lose the illusion bonus too. Basically, if you don't eat, you become weak, like a human. If you act like a vampire and feed, you gain great power but must also suffer the weaknesses.
Bethesda clearly wanted to move away from the "eat as often as you can" gameplay style of the vampires, but they went too far, turning it into "eat as little as you can". My solution solves the problem, making it "eat when you want power but you don't need to spend your entire game hunting."