I agree with what Pegasus says : I'm not at all a western rider, and don't want to be one.
We have in France à great classical riding tradition, and our horses and fitted for that équitation.
So I absolutly don't care about western riding from PP.
But, what I can improve with PP methode is the way you bring your horse into confidence, willing to do things, lightness in riding response... And then you chose what to do with your horse.
And in France it is mostly jumping, dressage, driving, trial... Not even 1% rider choose western riding.
Faites de lui un compagnon, pas un esclave.