Another problem I noticed with AST is level 50 content. They have no way to help mitigate incoming damage on the tank and party.

WHM
-Holy; AoE stun, can be used about 3 times before mobs are stun resistant.
-Medica II and Regen; if needed they can double HoT a tank during a big pull. In i130 BiS + Zeta that's at least 500 HP/pt.

SCH
-Fairy heals while you DPS, kind of like Regen/Cure I spam
-Sacred Soil mitigates incoming damage
-Shadow Flare slows mobs, this reduces the amount of damage they are doing to the tank
-Aldo, you crit this and it doubles, meaning you can focus on something else for a few seconds.

AST
-Possible chance of Drawing a Bole card.
-Double HoT like WHM, only weaker.

It's pretty noticeable. :\ It doesn't help that you don't get your AoE mitigation (one being similar to Holy and the other being like a Sacred Soil/Asylum that you can't move for) until level 58 and 60 when you're already done the leveling process. Meaning, up until the Vault and Neverreap/FC, you're basically Bene II spamming and praying for a tank who pops CDs.