4 piece is not just "for the players that can't manage their mana" its just a FREE extra spirit tbh, Holy priests are constantly in a chakra state anyway, and the itemization for the headpiece and chestpiece, is quite bad but there's one piece from the 4p (considering you're going for helm offpiece) that has crit which is completely retarded for us, but gloves have mastery, legs have mastery, and shoulders have haste. Haste and mastery are NOT bad for us, the loss of haste can be reforged and itemized into i.e getting the helm, cloak, neck off valiona/theralion, bracers off atramedes, ring off omnotron, belt off either rep or council of winds, and boots with VP (that's a lot of haste, especially if you also reforge into it).
I'm personally going for the 4p because that's is sincerely what I think, free spirit? yeah sure give me it. I don't have mana problems, I don't get fed innervates, and I'm rarely in the mana tide totem group so its not because I'm running out of mana that I'm going for it, its just because it'll give me even more throughput than what I already have. Again its what I think, call me a nub if you wish