Training equipment decisions are always discussed with you, the pet owner. You have a hands on involvement in the training and never are required to do anything you do not agree with or approve of.
There is no “across the board” answer to this question. At the first training session I provide a basic education of the training methods and proper use of available training equipment such as: slip collars, pinch collars, ecollars, martingale collars, flat collars, food rewards, etc.
It is my belief that you should be given a basic education on these items so that at anytime in the future you decide to use another available tool you will have a basic idea of the correct use, sizing, and technique so that any equipment can be used safely.