2 brakes is a good idea. I use my rear if I have to brake in a turn on a questionable surface. I don't like to fall down.

Contact patch on a skinny little 700mm tire is pretty small. With 2 brakes you double your braking contact surface (I understand the weight shift upon braking). It's not the same as the fat ole 32psi automobile tires. And I still like having back brakes on my car.