I still disagree with that. By knowing the fight really well, a good tank can pinpoint the exact mitigation it needs, and drop its tank stance on some windows. But, what if that knowledge was instead used to drastically reduce the amount of healing you need so that one healer can go full DPS mode, or that you could bring a 5th DPS ?
This would end in two different setup for different tanks. WAR could still be the king of stance dancing and be recommended for agressive tanking, while PLD would be for turtle players, requiring much less healing support. I think we've talked about that on another topic, and yes, these two setups can not be exactly perfectly balance, but at 1-2% overall DPS apart, the community wouldn't really bother.
If all tank jobs follow the same philosophy, we don't need three of them...in case 3.x didn't make that crystal clear
