Is healing supposed to be this...hard?

[Kabooa]

It's simply very inefficient to waste one of your big dps cooldowns so your healer can spam their 140-160 potency aoe over your 375 potency aoe.

While you are correct, please keep in mind that tank-to-anything potency comparisons are faulty.

Caster potency particularly is much more potent than physical, especially tanks.

Putting this into perspective, 160 caster potency (or Scholar's Art of War) is basically the same power of a equally geared Paladin doing Req-Holy Circles.

This is mostly irrelevant, since there is rarely a case for one making a trade off for the other.