Never saw the logic in encouraging vampires not to feed.
In my opinion, when you're a fledgling vampire, you should start out with minimum bonuses and maximum weaknesses. The sun will obliterate you in minutes, your skin might as well be made out of gasoline as far as fire mages are concerned, your drain spell is terrible, etc. However, as you feed more and more, you become more powerful, and the weaknesses become less and less and the bonuses become greater and greater, until you're able to take on an entire legion single handedly in an evening.
Increased powers should be your reward for doing what a vampire would really do. You should be stronger when you've fed and weaker when you're starving.
I don't get why people say there isn't a reason to feed. Do people enjoy being one shotted by fire spells?
Atronach Perk + Atronach Stone + Necromage = Complete Magic Absorption, making your weakness to fire completely moot.