That's because being a master at something requires something science can't quantify: you need to care.
I don't mean pedestrian caring. I mean a deep, rich relationship between you and what it is you practice. That caring translates into focus, attention, deliberation etc.
"Everything that can be counted does not necessarily count; everything that counts cannot necessarily be counted." - Albert Einstein
(PS - I'm hinting at Heideggers phenomenology here. You can watch a great documentary introduction to it here: https://www.youtube.com/watch?v=1-rmGy9gWvE)