oh, my favorite... "It doesn't work on high drive or hard dogs." LOL Let's break that down:
A "high drive" dog is highly motivated by certain things - typically things we can access and use as R+, such as treats and toys.
A "hard dog" is one who is insensitive or resistant to correction, physical or otherwise.
So, you're going to tell me that a dog who is easily motivated and doesn't respond well to correction won't flourish under a system that allows them to work for the rewards they place extreme value in, and doesn't place any importance on physical punishment? Positive training is practically designed with those kind of dogs in mind.