From what I've understood those nails "should be placed anywhere in the horse's hoof wall where wear of the hoof needs to be reduced."
So if the horse has toes that are worn to much and the heel part is to high you place some nails on the toes where you need to reduce wear. This way the toes will grow without being worn away to much and the heel will be worn away in a natural way. So after some time you will have a more balanced hoof.
I agree that you can accomplish that with frequent trimmings. So I can't see why this methods is better too. But seeing that it's gaining so much popularity I feel that maybe I'm loosing something.
They say that they can treat cases like this one too. They want to use this method to see what results they'll get. I'm really curious.
I think that they see this method as something wonderful only because we don't have excellent farriers. And this method seems to be easy to learn and use.