So what do we do, since he doesn't practice?
First of all, I pay attention to every single sound he makes in the Beethoven sonata of the day, currently the E-flat, Op. 7 - not an easy piece. Most of all I pay attention to the sounds he clearly does not like and to the wrong notes.
Today, again, a significant connection between the two clarified for me what the sonata is really all about: It is about imbalance injected by unwelcome black keys into what would otherwise be a stable, or at least bearable environment.
He gets it every time. He leads me into Beethoven's brain. It is nothing technical, nothing theoretical, just pure ear-based responsiveness.
A position of privilege.