Why does the writer refer to the guitar incident? Which idea does it support?

When Stephen Hawking said that things such as disabled Olympics were a waste of time, the writer agreed with him. He remembered the years which he spent trying to play a Spanish guitar that was considerably larger than he was. He was very happy when he unstringed it one night. It supports Stephen Hawking’s idea that the disabled should only concentrate on what they are good at, and not take up things unnecessarily.