That may simply be because lore skills in general have less interesting and impactful effects on the game world than the main stats. Mostly, they just provide boosts to things you can already do, like stealing more valuable things and gaining more information at points. Which are things that magic lores can do, in addition to some other useful applications here and there.
I feel like this conversation about standalone magic lores has mostly exhausted itself, although it certainly was interesting. Good talk, Estel_Edain.