I'll never be able to be Richard Bandler even being close to him or learn from him, simply because I think differently. Despite this, I am also an engineer and I can understand some of how it intends.
In this world of phony trainers, exploiters, self-proclaimed gurus, and money-grubbers, tarot readers, is usual the self-proclamations of heirs, cousins or brothers-in-law of Bandler, capable of transmitting his word even though they have just seen him in the back of a book.
All of this squad who have found in the PNL a way to overcome their problems of self-esteem, childhood traumas or simply to make money at the expense of gullible people looking for the solution to all their problems, are nurtured by self-invented mythology about where they learned of PNL.
Bandler, in my humble point of view, has never used the PNL as a toolbox from which he could choose which is better in every moment. In this regard, I agree with other trainers (of which will keep anonymous) about the famous book of Dilts about Sleights of mouth.
This set of tools without any order, simply don’t match with Bandler’s way of thinking. The Sleights of mouth (as Dilts called) are a tool that Bandler uses strategically and not necessarily asking questions. This book is the product of Dilts mind (creator of great recipes) trying to understand what Bandler was a doing. Simply it's a model of Bandler’s world. The Dilts model of Bandler's world.
The Sleights of mouth are based on very clear language logical structures, which Bandler uses to create a result in a wider context, and as part of a wider pattern of change.
Bandler’s strategic thinking is based on the calculation of the subjective structure of the person, and his pragmatic study. Bandler plays constantly with the change of beliefs based on several linguistic presuppositions in different logic levels. Everything that he uses is part of an overall strategy, not a try and error test in search of what can work.
Ask your NLP trainer, what he knows about the logical structures that support the belief system of someone, the presuppositions of 2nd, 3rd and 4th order, and what the restructured Metamodel according to the precepts above is.
If the answer is: "I do not need because I do something better than I have developed," the question for you must be: Do I want to learn about NLP? Or Do I want to learn about what he has developed?