I used to take a hybrid art, a form of Tang So Do, and they encouraged black belts to learn other arts and bring them back. One such gentleman went to Muay Thai and some form of Karate plus a few other things. Eventually he went to the Dillman style of pressure points.
What he said was that Katas actually used pressure points but they wasn't revealed to students under black belt, they were hidden within the form. He showed us how to use PP in all stages of our form. Since our's was a hybrid art, our form was 10 years old, the guys who laid out the new art didn't know PP. Nonetheless he could knock you out with pressure points.
Do I believe in pressure points/accupunture....yes. I have seen them applied and the only way I could quit smoking cigerrettes was acupunture.
Do I think I could knock someone out in a fight using PP....no. Unless I was extremley lucky I dont know how to light them up so the meridans can attack each other. People move too much when you are tring to punch them making the PP to hard to hit for my old eyes. Every martial art strikes PP to buy that half a second that can turn a fight, say a punch in the nose.
Can other people use PP to immoblize someone, the Dillman people believe so. The Chinese people studied PP for generations so they probably know what is possible real time fighting and what is not.
Thats a lot of words for no answer.