True, Physick has the same potency as Cure I (correct me if I'm wrong), so a WHM will cast it for the same amount of healing. You could make a case for a strong conjurer being able to use all sorts of healing magic the same way no matter what it was, even though the same would happen if the same WHM cast Ruin. But there is some point at which the gameplay and story/lore have to separate; Ruin and Physick are both sub-level 5 skills, and ACN's other cross-class skills are enhanced by a trait that only ACN gets. So you could say that these beginner skills could be used without a proper grimoire, but even level 2 Bio wouldn't be usable without one according to gameplay.
Forgive me if this kind of ramble-y, it's late and I'm still quite busy.
Forgive me if this kind of ramble-y, it's late and I'm still quite busy.
