Nocturnal Sect has benefits that Scholar doesn't, benefits that are often over looked... for some reason. From what I know comparing their skill sets:
- Instant cast healing for 10s every 150s
- Instant cast Benefic II on occasion
- A very potent (150 per tick) AoE regen and damage reduction barrier on a 90s CD
- A proper AoE heal that doesn't have a 30s CD
- Disable, which is better than Virus in every way
- Higher potency shields (not by much, but they are) that can scale up to 950 effective potency between the healing and shielding components on demand
- The ability to effortlessly heal two targets on demand with no micromanagement
- An AoE stun (not very useful in raids, incredibly useful in dungeons)
- The ability to reduce their enmity generation for a significant amount of time
- Higher potency DoTs that can't miss (Miasma and Aero can, Bio and Combust can not)
- A passive 5% boost to all healing spells (think of it like always having a slightly weaker over time Divine Seal active)
- And finally the cards, all six of which are exceptionally powerful, have a myriad of uses and applications, and can be used at almost any point in any fight.
Many of these are unique to Astrologian as a whole, yes, but these effects are part of what must be taken into consideration when looking at Nocturnal Sect. So no, I think what the problem really is that the metagame is overly rigid and stubborn to change. The Sect itself is fine.