From a non JW perspective: Older children are usually groomed through High School for a preparation for their future. They are encouraged to choose a profession of which they will excel and pursue the foundation of a future career through college training and education.
Jehovahs witnesses ( to my eternal criticizsm of the faith) deny this thinking and pursuit from their young people. It is substituted with "preaching" and " jehovahs work comes first". Naturally the child wants to "please" and will follow whatever direction is mandated from parents. Some kids rebel ( and with good cause).
What a stupendous waste of opportunity for all those young ones caught in the " theocratic trap".
I was one of them. I am lucky to be where I am now.