AST is in a very good spot since Creator as said HyoMinPArk and even better since 4.3
It could do with a bit of QoL tweaks but it's virtually the best healer in terms of healing output, raid buff and decent personal DPS.
Yet, I agree that it could be good to have some re-thinking of sects- as shielding is not so efficient unless a fight requires it. That's just what I'm looking for in 5.0. The rest is almost already perfect.