It's not even really the potency of the cooldown reduction. Everyone hates the Spear for a reason. The only abilities that tangibly benefit from cooldown reduction are the ones you'd use immediately after they came off cooldown. Aetherflow is one of them. Shroud. Draw. Assize, but only for the mana recovery and the damage, not the heal. You know what doesn't benefit from cooldown reduction? off-GCD heals. Sure, you could use Tetra the moment it came back up, but what if nobody is hurt? You can't plan around it, doubly so because the lilies are random and you have to use the emergency heal you need to use when it's needed by the party, not when you've waited for three lilies to make it come back slightly sooner.

Plus it's a system that actively rewards cure spamming. I'm not saying everyone needs to be optimal, I'm saying the game shouldn't disincentivize optimization. New Enochian comes with a reward for keeping your rotation up, not spamming Scathe.