[sev]

> the chess example where 3,000 hours get some people to masters status but 25,000 is not enough for others

There are so many factors at play. One important one is environment...e.g. if your parents are chess masters and you've grown up watching them play, that's not being included as part of the 3,000 hours...and it should be, because the one with 10,000 hours might not have such an advantage.