I understand your logic, but Even if SCH got a AoE Embrace(100 potency)+Succor, it still wouldnt match Cure III potency which cost the same amount of MP. WHM would still be AoE Healing King. WHM has 3 AoE Heals vs SCH 1. Not to meantion WHM has a spammable regen vs SCH's which is on a 60sec CD. I'm not saying give both healers all the same spells which you are implying. Im saying both should be able to do same thing
Sorta how WAR and PLD was before 2.1. The 2 had different styles of tanking, but one was significantly better than the othere. You can still keep the different styles but both should be able to do the same thing equally.