Thing is, your SCH partner doesn't give a crap about the +5% potency Benefic II cast out of Nocturnal. A 5% bonus to healing spells isn't nearly as strong a contribution as bringing on-demand HoT effects with Diurnal while still being able to use the base kit without the tiny, tacked-on potency buff.

Again, if you're not bringing Noct to cast shields, you aren't bringing it at all.