I'm assuming this is in Portland. It cannot last long with the bike culture there. I'm figuring it was built by a well respected frame builder and the rear brake cable routing is what they felt best met the needs for the bike and caliper being used. All mixte caliper setups involve compromises. Brake cable housing point up allowing water to enter or the arms of the caliper can catch your leg.

If it were me, I'd be on my way. Dinner can wait. Celebratory Taco's on the way home.