I think that you can work any content just fine in diurnal or nocturnal if you use all that is available in your toolkit. I see so many arguments that you can't do noct ast with SCH, but, yes, you can. There are changes to abilities that may not have the best synergy but you forget that being in diurnal lowers your healing potency in the first place. An AST can not replace a sch or a whm, because we are neither, what we have is a series of unique and flexible tools and we should look at the flexibility, not the downside. Noc provides bigger up front heals, but it also provides an aoe shield with no downside that drops incoming damage consistently. Sure we may not be using our scholar style shields if we work with a scholar, but we CAN stack with the defensive buffs a scholar can do on the ground to mitigate incoming damage to an absolutely silly degree.