And you are wrong because it is worth it to use Dissipation on cooldown.
- Embrace: Cure Potency 180. Recast 3s (longer if you are moving at all). Total potency of 1800 over the course of dissipation.
- A single Cast of Sacred Soil: Cure Potency 100. Total potency of 500 per target over the course of a single cast. (2000 in light parties, 4000 in full parties)
- One cast of Excognition is 800 potency. This is a 200 potency gain for a third of your lost embraces. And because you can target the heals, it comes out ahead
- One cast of Lustrate is 600 potency. This means even if you burn all of your gained Aetherflow on Lustrates, it's still not a loss because you can direct the heals and don't need to worry about losing faerie casts from her moving.
Learning how to map out your faerie only abilities for 10 of 60 GCDs so you don't use them during your dissipation window is part of the actual skill expression and depth of the class. It is still shallow but let's not make healers any more brain-dead then they are.
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Sage isn't scholar, even though sage was designed as the dark mirror of Scholar in play. Sage doesn't have the utility of Ruin II for movement. Sage doesn't get the ability to deploy a critical shield for half of someone's health to the entire party. Sage cannot place Kerachole with the same freedom Scholar can soil. (It was for this reason alone that we had to swap our Sage to the central position for Purgation. Because his regen wasn't quite hitting everyone if we put him on the edge like I was.). Sage cannot have Kardia remotely heal with a place commend (Very useful for any mechanic for clock spots.) Sage doesn't have a party reposition that Scholar has in Expedient.That'd be like saying to Sage: When you use Rhiozomata your Kardia is removed from the target and you can't use Physis for 30s and your Addersting generation is stopped.
Rhizomata isn't even a direct comparison to Dissipation. It's on a 90s coooldown and only grants a single stack of Addersgall! Sage gets fewer resources than Scholar does for healing, if only so slightly, and in return they have a simpler kit and slightly more reliable generation. This is good Scholar and Sage need to have things that make them play differently.