back in the day we learned encounters and didnt have the gear we have now, our guild sorta had the same mentality going.
"we dont need rogues"
"priests do not heal rogues, they must simply bandage"
and we had bout oh...6-8 of us in the guild and usually an avg 3-4 tops would get to go, sometimes only 1 or 2.
then came the wake-up call, esp on the ragnaros fight. when we actually bring 5-7 rogues (esp well geared / smart ones) we finish MC faster then ever before.
so now at least im healed now esp for certain fights because we take down mobs fast.