With respect when you study medicine you become a doctor, pharmacist etc. Same with accounting. Now why would it be different when studying CRT? Do you know it? Have you studied it? Do you know even medicine is a theory. When we understand the theory and put it into practice, you are a practitioner. Don't let words offend you or disturb you. The need to have a theory to try understand what's been happening should for more than 500 years is a cause for offence.