Putting alleged "OP" or "UP"-ness aside, I do think that for a healthy game design moving forward both WHM and AST need to be retooled slightly so that their healing and DPSing feels a lot more natural and fluid like SCH's, or else this current healer parity will only continue. As someone else said in the thread, it's more that SCH's kit feels "complete" - aka innately designed from the ground up with the concept of "DPSing healer" in mind, from having a GCD and mana-friendly independent source of healing to their powerful oGCD substitutes to casted heals.

For a brief example, putting the differences in rDPS and utility aside, imagine how much friendlier WHM would feel to a DPSing healer if Tetragrammaton was given 3 charges with each charge having a 20-second CD. I'd hazard most would be fine with removing Cure II if that was what was required to keep the balance, even. Imagine if instead of lilies WHM had a passive aura that pulsed a 150-potency smart heal on the most injured ally within range every 3 seconds. Imagine if Cure III was now MP-free and oGCD but on a 60-second CD, etc. Even small changes for WHM like adjusting frickin' Aero II potency but making it a 30-second duration like every other healer DoT in the game would go a long way towards helping their overall fluidity (less time reapplying Aero = more Stone IV).

Alternately, if the game ever does a World of Warcraft-esque "stat squish" down the line, they could always use the opportunity to honest-to-goodness adjust healing modifiers and potencies relative to maximum health bars so that having a strong spammable toolkit of GCD-laden heals is actually a boon and not a bane, due to healthier healing requirements for content. *shrug* But if that's never going to happen, then the other healers really need to be made more "DPSing-while-healing friendly", IMO.