Since the advent of practice fairways, "swing instructors" have found it easier to stay on the range and do 1-hour lessons one after the other. It is an easier business model for them but not a great way to teach the whole game.
Golfers have also been brainwashed into believing that if they can just get their swing "right" or "correct" that their scores will come down.
I am a golf coach
I will guide you to you better golf by teaching you
I believe that the majority of golfers would just like to play better golf and they do not have to make big swing changes to do it
The golf course is the only place where a true game assessment can be done. Trying to assess someones game at a driving range is guesswork.
I have found that the main reason golfers never reach their goals is because they don't know where they are actually starting from.
It is like putting your destination into a GPS Navigation System but never allowing the GPS to find out where you are starting from. I don't care how many different plans it tries to make for you, it just isn't going to work and you will probably be more lost!
It is only on the course, in real game like conditions, that we discover where the true strengths and weaknesses are in your golf game.
Only on the course will I see every see every single part of your game to gauge where you are truly starting from