PW:S Nerf from 4.06

If you didn't see this coming then you just weren't paying attention. The PW:S spams-a-bility garnered by Disc priest in 4.06 was good, too good. There are multiple logs posted by top guilds with their Disc priests spamming shields like it was LK, being funneled Innervates and working a mana tide rotation just to keep it going. While nobody is going to complain about being OP from the 1st person perspective, I think most Disc priests can admit that it's more fun utilizing a full complement of spells and trying to maximize buffs and an effective spell rotation rather than clicking over and over again on unit frames with one button.  What I don't understand is how the 4.06 PW:S ever made it to live. Simple napkin math from looking @ patch notes indicated that with enough Mastery and SP, this was going to happen, so how did the dev's miss it?