Why the imbalance in cloth self-buffs?

Warlocks and Mages both recieved new self-only buffs in the expansion, giving Warlocks two and Mages three options to choose from to adapt to different situation and specs.

All of the clothie self-buffs, save for Inner Fire, give multiple benefits from passive regen, to resistances, damage, ect.
They also all have 30-minute durations and no annoying charges.

Why are Priests the only cloth class not to see a new buff?
Why are we the only ones with a self-buff that adds armor, and only armor?
Why is our sole buff the only one with 10-minute duration, and laden with incredibly tedious charges?

*edited the title-Nethaera