Steve
Mostly Harmless
I try to stay away from “should”. Objective standards are generally a good idea, and I have my own opinions about what works and what doesn’t. But a school is a business, and the instruction is a service. The business owner offers whatever service they like and the consumer can either choose to buy it or not.Then by the same token a sensei should make it clear what a student needs to do to get a black belt in his dojo, or whatever rank the student is striving for. And a student shouldn't be afraid to ask.
A martial art is not exactly the same as a primary school teacher. The biggest difference is that teachers are accountable to external standards. Martial arts instructors are not.
A lot of martial arts instructors set their own standards and decide for themselves if they’re meeting them. Is that a good idea? Well, maybe not. But if the customer is happy with the product, then the answer is yes, it’s good enough.