"The child's parents wanted the child to pass the proficiency tests at each level to certify that the child is very competent at playing piano. The 10-year-old child does have talent and has passed the tests for Level 5 already. If, in a few years, the child passes the tests for Level 10, it will demonstrate that the child is extremely capable - as good as many adult performers. Some prestigious universities would give substantial weight in their admission decisions to the child's talents. However, the child hates practicing, and often whines and screams when asked to play. The piano practices are taking time away from normal schoolwork and other activities. The household is often a quite miserable place with all the arguing going on, so now the child and one of the parents want the child to quit piano, but the other parent points out that several years have already been invested. It would be a huge mistake to quit now." Please explain why.