An interesting topic you've started here; and valid points made, certainly. As a vampire myself however, for sure, I will have to note that you've neglected to touch on the greater vampire phenomenon, in some ways. Sensitivity to sunlight is one thing, but outright burns, after only minutes of exposure to sunlight is quite another matter entirely, is it not? Or the matter of blood: there are those who claim that they do not require blood to survive, or that they can persist on some vacuous idea of "energy". I can neither confirm nor disconfirm the latter, but as for the former, I can certainly speak to my own experience: blood is a necessity, and ordinary, human foods are effectively worthless. As a full-blooded vampire myself, I cannot speak to the strict application of this principle when applied to less-pure branches of the vampiric lineage, but I have yet to meet a vampire who could persist without blood (though I did meet a half-vampire once who was capable of gaining nourishment from other foods). There is also the matter of manipulation; call it hypnosis, or mesmerism, or whatever you wish: I have yet to meet a vampire, or even a half-vampire, who did not display an extreme natural talent for it. These are but a few of the decidedly vampiric traits which you failed to address; I simply felt it necessary to note them.