Bob, in many cases, I agree. However, teaching is not the same as demonstrating. If it was, we'd be back to the days of saying "sit tight Bloggs, watch what I do, and one day maybe you'll be as good as I am".
Of course an instructor should set a good example by demonstrating good flying and good airmanship.
But how do you teach airmanship?
Now if anyone can reply on here, I'll be amazed, and probably not impressed. My flying instructors’ handbook runs to 100's of pages. It scarcely mentions "the cerebral skills". In my mind it should be twice as thick, to teach thick people like me how to teach airmanship.
So, answers on here will be superficial, at best.