A common error in teaching is this: teach secure foundations first, then allow for creativity.
Suppose we could establish a basic truth that every student should learn first. Here is one candidate:
"Always play piano with a natural curve in your fingers"
How does a student learn this? What does natural curve mean? How do you use the natural curve to push a key down?
There is no way to download the idea directly into the student's mind. The teacher can only gesture, move around his hands and fingers and make noises with his mouth. Those noises can correspond with words the student understand, or not. All in all, the conditions for communication are always quite bleak. It's remarkable that we sometimes do understand each other.
The only way a student can make sense of it is by guessing what the teacher means, then correcting that guess through feedback and their own judgment. In other words, they must use their creativity even to learn the basic truth. Even if we wanted to establish foundations and then allow for creativity, we cannot do it.
This would be harmless if the foundations matched the student's own problems, but often they don't. Solving your own problems is how you become more unique, because everyone's problem-situation are different. When creativity is used only to solve the teachers set of problems, students become less like themselves. Worst case, they come out the other side afraid to be themselves.
Thelonious Monk said: "A genius is the one most like himself."
Instead of teaching secure foundations, encourage genius by helping students where they are.