on forced instrument learning (and only piano/violin, nothing else)

Renewable Music: Piano and Violin: Blunt Instruments of Bourgeois Education:

But I do wish to add two caveats. The first is that the orchestra (professional or amateur) relatively rarely uses pianos and though there can be many violins, we need violas and bassoons and horns as well. A world full of "Chinese Mothered" violinists and pianists will be a world in which violists, bassoonists and horn players will be valued more highly. (The "Chinese Mother" appears not always to be wise about economics.) The second caveat is that I want to work with and listen to musicians who are not only mechanically competent, but are honestly interested in the music and, generally speaking, cheerful rather than fearful about music-making. Unfortunately the tactical application of fear appears to be a major element of Prof. Chua's pedagogy; in all my experience of music, I have never seen any necessity for fear as an element in its production.