choosing means not choosing

One must decide between A or B. Choosing A means not choosing B and not getting any of B's benefits or pleasures. This is called an opportunity cost. We can construct a counter-factual of non choice B and posit a comparison of A and B.  Can one become a great musician, or athlete without choosing. No, one must always forego something else to get this mastery. Watching tv, socializing etc are all choices and may have to be foregone in the pursuit of excellence. Choosing is hard because most people don't choose fanatically. They flow their choices from day to day often mastering nothing.