I think for any sufficiently complex human activity, including writing, musicianship, or performance in a sport, there's no way to be objectively good at every

I think for any sufficiently complex human activity, including writing, musicianship, or performance in a sport, there's no way to be objectively good at every aspect of it, and there's no one measure that captures all the different possible ways to excel. Overall performance is a complicated mix of competencies, some of which are easier to measure objectively than others. Different observers will judge the "goodness" differently based on which sub-tasks they consider more important. Even among the "greats", you can point to sub-areas that they don't do as well.