The question is - why add an additional cultural layer, and what does it really get you?
Some people take the coach structure to odd extremes too, both as the coach and the student, so you can't really use that as a negative against one and not the other. Realistically, a lot of people come to the art for that touch of another culture and the atmosphere of discipline and respect that it conjures in our minds. I don't really see any negatives to it and it brings people to the art that probably wouldn't be there otherwise, which some might see as a negative, but I do not. This doesn't really apply to the more Japanese than the Japanese extreme though, but that is an extreme.