I am not questioning Petracchis system. I also use it. But you don't necessarily have to know or think in terms of the names of the positions when you are playing.
Correct.
The name of a position doesn’t matter. Labels are only here to facilitate communication. It doesn’t matter what you call something as long as someone knows what you are talking about.
In the world of bass academia; different bass teachers use different terminology all the time for the same thing. Actually I see arguments between people were they believe they are arguing a special technique. In reality it turns out they are arguing about a different description of the same thing.
Some guys create their own ideas for publication without checking to see if it is already published. Frequently I look through technique books that seem to be an alteration of Simandl. I am not sure if it is a clever way to make money or if is presenting something in an ever so slightly different way to help someone learn. I have found great use in things that incorporate solid methods so I don’t care much about this, but I think it goes to the point.
The simple fact is you cannot learn technique from any book. Books typically only give us exercises to practice and develop technique we learned through teachers.
I have noticed when studying with advocates of a particular technique or the creator of one; the first reaction is “wow they literally mean what they say.” Then as time goes on, you start to get “loop holes” or special ideas that come from a different (or a competing) technique in certain situations (whether the source of the idea is cited as another technique or a special idea gained from the teacher, or the teachers teacher). Later, you are able to use discretion on such things. Then you come away thinking you have some special knowledge on the technique that you can put into a book.
When I see multiple techniques I find plenty of common ground on most of the ideas. Whatever technique someone ties themselves down to the important thing is they develop an ear and as a musician.
I am probably a liberal when it comes to technique. I did adopt a teqhnique from some one who invented it. I myself thought it was radical and took time for me to realize it was the best for me. It takes some habit breaking to learn (including habits that would be considered “good” in more conventional techniques). I'm not promoting it here, just thought that it would speak to where I was coming from.