I'm getting to this point. I've been able to clear the content I've attempted on AST, but I've also always been aware that I would be having an easier time on SCH. I've just started healing the Heavensward dungeons on my SCH and have definitely felt far less pressed so far compared to how I felt while leveling AST. While ASTs are certainly capable of clearing the content, their emphasis on faster, more mana-efficient heals means having to cast more to achieve similar results, which leaves less room for DPS and also reacting to emergencies and/or mechanics.

I very much prefer AST's general playstyle to that of SCH's, but I also haven't been a main healer for a long time and don't necessarily always enjoy taxing myself needlessly when healing to assist my FC. As such, I'm probably going to be going back to SCH, though if there are further changes to AST, I'll likely give it another whirl.