Its actually a nerf and here is the reason.
-A decent holy pala would never goin to use it anyway.... its deep enough that if u get it you are RETRI and not holy.
-Making it based on BASE mana it means that its not getting any benefits from any gear changes.
Here ppl gonna say that Retri gear has not INT on it, but that is childish. And its childish cause noone forced you to wear Retri gear. I mean you good get 4/5 retri gear and all other pieces from Holy set, so INT +.
But again thats what Blizz found as an exploit so it became based on BASE mana.
so good QQ