Rachmaninoff, truly a man of many talents and of mystery!Looking at those photos, yeah, it was the right choice for him to return to piano music.
What I really liked about this video is the first few minutes, where he played that Mozart, and talked about the impulse placed and where.
The more advanced the piano player, means the less impulse, or even only one impulse.
If there is only one impulse, then the person playing that piece, can put their impulse anywhere they want, make it play how they like.