Reasons:
Scholars require using Energy Drain for mana management. Missing an Energy Drain no longer provides mana as it did in ARR. The same goes with using Bane. Miasma missing is wasted mana for a Bane.
Dungeon Mechanics. The two new dungeons have mechanics where two people are randomly incapacitated and the remaining two are required to do damage to free them. Healers are placed at an distinct disadvantage compared to other classes. Tanks get accuracy from tank stance.
Relative fun. Players generally consider dungeons lesser content to raids. Players who raid expect a certain challenge that is different from casual content. Placing raid mechanics on casual content isn't fun.
Money/Time disadvantage. Tanks and DPS don't have to worry about accuracy requirement because their gear is swimming in it. If healers want to be able to do damage during dungeons consistently they have an extra expense tanks and DPS don't.
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