Quote Originally Posted by Kraco
I wonder if they were hinting the vice-principal during her school days was first convinced by Wakana's mom to join a choir (or some other singing club), but then Mahiru suddenly left to continue on her own, leaving the vice-principle behind and confused. Certainly such a thing wouldn't be the only factor developing her so unpleasant as a person, but it might have reinforced the characteristic.
That's a possibility.

The scenario I had in mind was more simple: that the Vice Principal was simply stating that despite Wakana's mum saying she needed to do music with people, she didn't really need those around her and excelled at her own breakneck pace anyway.

Japanese monks are funny. They don't have to pay tax (from what I've heard) and take a much more pragmatic roll by providing religious services without having to act like a saint themselves.