You do need to separate teaching ab initio from what happens after licence issue. Teaching someone with 5 hours P1 to join O/H doesnt mean you are teaching a procedure that should be blindly followed at every opportunity.
The O/H join is a safety net for low hour cross country students. Once you are familiar and confident with airfield procedures I encourage the most expeditious arrival commensurate with experience and traffic.
Good teaching isnt about insisting that students follow what instructors feel is the best way to do something, its about teaching options and encouraging judgement. Too many instructors base their teaching on what is best or appropriate for them.
For instance I teach point and power and also elevator for airspeed but I let the student decide which method is best for them.
Same for PFL, I teach several methods but allow the student to decide which method suits them.
If your struggling with this try thinking of the student as a customer!