Because Chang and Bernhard are forward thinkers and refuse to accept the worth of something blindly. Bernhard and Chang didn't invent this stuff, and neither did your teacher. You'll find anywhere in life that there are generally two kinds of people (and I see this in the corporate environment all the time, and it really irritates me) - you see the "but that's how we've always done it" kind, and the "lets try to figure out how to do it better" kind. Your teacher sounds like the first kind, Bernhard and Chang are the second.
-Paul
You might like this. (You may have seen it before but I think it suits this thread)
Start with a cage containing five monkeys. Inside the cage, hang a
banana on a string and place a set of stairs under it. Before long,
a monkey will go to the stairs and start to climb towards the banana.
As soon as he touches the stairs, spray all of the other monkeys with
cold water. After a while, another monkey makes an attempt with the
same result, all the other monkeys are sprayed with cold water.
Pretty soon, when another monkey tries to climb the stairs, the other
monkeys will try to prevent it. Now, put away the cold water. Remove
one monkey from the cage and replace it with a new one. The new monkey
sees the banana and wants to climb the stairs. To his surprise and horror,
all of the other monkeys attack him. After another attempt and attack,
he knows that if he tries to climb the stairs, he will be assaulted.
Next, remove another of the original five monkeys and replace it with a
new one. The newcomer goes to the stairs and is attacked. The previous
newcomer takes part in the punishment with enthusiasm!
Likewise, replace a third original monkey with a new one, then a fourth,
then the fifth. Every time the newest monkey takes to the stairs, he is
attacked. Most of the monkeys that are beating him have no idea why they
were not permitted to climb the stairs or why they are participating in
the beating of the newest monkey.
After replacing all the original monkeys, none of the remaining monkeys
have ever been sprayed with cold water. Nevertheless, no monkey ever again
approaches the stairs to try for the banana. Why not? Because as far as
they know that's the way it's always been done around here.
And that's how company policy begins...
Or Piano teaching methods?