It is not music's function to express rational necessities.
Children are given Mozart because of the small quantity of the notes; grown-ups avoid Mozart because of the great quality of the notes.
Mozart is the most inaccessible of the great masters.
When a piece gets difficult, make faces.
The sonatas of Mozart are unique; they are too easy for children, and too difficult for artists.
The notes I handle no better than many pianists. But the pauses between the notes - ah, that is where the art resides.