Now that I have been 90 for a while and done some extreme practice I can say that sage really does not keep up vs a scholar.
Some heals as others have said sound like you want to use them BEFORE damage comes due to the mitigation but due to its higher cure potency you dont want to waste that heal, pepsis just sucks and unlike sch we have no way to ensure a fat aoe heal when we need.
If I have multiple dps making mistakes I can easily pocket heal them on other healers, not so much on sage where you run out of addersgal and ogcds and even then you did very small heals!
The healing + shielding output feels too weak to cover people's mistakes like I can on my astro or on sch.