Guidelines are different according to your country's demographics. I was in china two years ago, polished my shoe once a week and that too as a habit, it was not required as there was hardly any dust around... while in Karachi you need to polish twice a day....
So since USA has a different temperature, different road conditions, we can follow what toyota US says about changing CVT oil, then again quality of product may also be different, be it the oil or the gears etc.
Change as the book says, then again, i assume that if you can afford a 2 to 3 million car, you can afford its oil change....
Lets leave this childish argument....