I haven't read the book, but what I heard about it second hand is that 10k hours is about mastery, not success. You can be a master without being successful and visa versa. But mastery sure improves your odds of success. Of course 10k hours doesn't guarantee mastery either. I've put in that much on the golf course and still suck at it.
I've heard it's also important to distinguish _practice_ as separate form of _doing_. Without knowing anything about your golf habits, so not intending to criticize, but to use as an example: 10k hours of _playing_ golf is quite different from 10k hours of _practicing_ golf and the latter would, from what I understand of the distinction, have a more appreciable outcome. As you said though, mastery and success are not…
I have a friend who hardly ever plays, but still beats the snot out of me on the course. So in my humble opinion, trying to eliminate natural ability from the equation is misguided.