Looking to learn Core Barre and fuse it with functional training

I have taken Barre Classes and to be honest I don't really understand the why of it?
It's so far from being "functional" that if you could figure out a way to put function into your idea it may represent itself in a much more resonable manner to the fitness world.

Use your expertise as a trainer, decide what your focus would be and create a program that you think would appeal to those looking for a new approach.
Incorporate training techniques that you truly understand, know the why's and how's of your choices and with confidence you will be able to teach it to others.