Overhead range of motion is a must for a countless number of sports. From weight lifting to basketball, from tennis to gymnastics, from wrestling to swimming, the list goes on.
Being able to stretch the shoulder abductors and extensors, as well as scapula inferior rotators allows the arm to come up to at least vertical line. In many cases more than 180 degree is needed, in throwing sports for example, such as javelin, football and baseball. Same applied to serves in volleyball and rocket sports.