Originally Posted by
Schizoide
Well that's a bit of an exaggeration, tanks still need to handle positioning and know the fight more than DPS without encounter-specific roles.
The problem is that the devs' blog actually made a heck of a lot of sense at the time. Remember back in MoP healers spammed smart AE heals all day long and many raids didn't even need to designate tank healers. Their gameplay was just awful. So you don't want to take that away from healers-- they need to save the day too. It's a delicate balance, where both tanks and healers need to have direct impact on tank survival.
It's a non-trivial problem. My off-the-cuff solution would be to nerf external tank cooldowns, nudge healing downwards X% and tank active mitigation up a compensatory X%, and give all 4 tank specs much more impactful DPS/healing tradeoffs, where they are tuned to do 100% of a DPS spec's damage while actively tanking in damage mode but lose enough survivability such that it can only be done when over-geared or during low damage periods.
I think my solution above is in the right ballpark, but I'm sure I missed important points. It really is a non-trivial problem with tons of moving parts. That's why Blizzard pays the big bucks! Heh.