I am of the mind that the healer role is already by default more complex than the other roles. Even more so on controller. I can understand wanting a basic straightforward healer for the player base.
I've played a fair amount with people who either don't bother with savage content or have been on o9s since the start. It's with these players in mind that I can condone the path SE has been walking with WHM until now. (Even though I used to main WHM myself and was just as frustrated as the next with the state of the class). A healer that is essentially forced to only to worry about healing and mechanics is a godsend for some players.

Yeah WHM will always be unbalanced in a farm setting (less during progression) as long as they stick to the pure healer thing (which they have for the past what? 4 years now?). It's not that bad really, I haven't seen any lockouts in recent memory. But, regardless, right now the more important fact is that WHM is just outright clunky. It has no flow, clipping galore, instant GCDs that you can't fill, useless traits and gauge. That's what needs focus and is 5.0 material.