During my years at Peabody I studied with Leon Fleisher.
His studio was full of power players. They could play big and loud and fast. But if you know anything about Mr Fleisher, you know that big, loud, fast playing does nothing to impress him. If he even got a whiff that your playing focus might be on impressing your audience he would say something like, ‘If you are interested in such amazing acts of physicality, I suggest you join the circus’.
He emphasized to us again and again that:
Good technique is the ability to make the sound you want exactly when you want to make it.
Good technique isn’t just the ability to play the most difficult etudes flawlessly. It is the ability to make the sound you want EXACTLY when you want to make it. Good technique is the ability to make realized your musical choices.