From back in February:

Quote Originally Posted by Vastin
One of the elements of this re-work was to give us better control over how power scales throughout the game, so modifying the general balance on it is much easier now, whereas it was rather difficult previously.
Quote Originally Posted by SingularityNow
How have you accounted for the opportunity cost we're going to incur in adding icpr because all boss encounters currently at higher tiers are dps races that leave no room in our builds for a reduction in dps?
Quote Originally Posted by Vastin
It's actually one of the reasons I decided to coincide this with the Mastery change - which should be bumping player DPS noticeably and will likely offset any hit from power management mechanics.
I never saw much of a mastery change, I hear it is bugged over and over, though no one says how. But I assume it is. And now with the health and mit increase to monsters across the board, how do you fit this new change into your previous statements about the opportunity cost of balancing against the power changes?