You definitely are more sceptical about the Japanese ways then I am !
So if we would not incorporate the original sensei -semai - kohai structure how do you envision the direction to go?
There's really no one way to coach - or to teach anything, is there? Every culture and region has their own customs - and even people within those regions (depending on how fine-grained you want to get...). Why should it be any different - what does it get you?