I'm enjoying the new WHM >,>

[Atmora]

Correct me if I'm doing this wrong, but unless I know a fight specifically calls for heavy healing, of which there are few, I'm going to blow that CD as soon as possible to maximize damage uptime.

If you're trying to optimize you will only use your healing cds at set times, and let regens tick people back up. So you wouldn't necessarily be using it off cd.

It's better than stoneskin. Cure 2 into Benison, which I don't think is even that far off mana effeciency wise than a Cure 1, is a lot of potency you can fit into a single GCD while also providing a higher shield than stoneskin if your co-healer happens to be on the floor or otherwise unavailable.

Mana efficiency isn't actually very important past minimizing OH, what really matters is GCD efficiency. If you're constantly making GCD inneficient moves like cure 2 into benison you're losing potential DPS over the course of a fight relative to something like SCH.

Highest personal DPS. Which is actually a thing now that they have godlike MP management. A thing for good WHMs anyway.

This is irrelevant, WHM had no mana issues as well as the highest personal dps when Creator was on farm but was still the by far worst job in the game. The problem is that even though it's personal dps is the highest SCH alleviated the number of healing GCDs needed from both healers over the course of the fight by a significant margin, meaning the potential raidwide dps was higher if both healers knew how to heal properly. Eos is just the most efficient healer in the game since it's better than regen but doesn't take a GCD to use.CH.