> But as a society our measures are mostly external. If someone succeeds, that's all we see.
The notion of external measures or what is readily apparent, is also why 'luck' feels like a simplistic and incorrect explanation for success, in my experience. A lot of people who are successful create their own luck (or rather, increase the probability for their personal successes). They set themselves up to be successful despite variability and randomness, and despite differences in natural talent relative to competition. They focus on the right things, they push themselves harder than others think possible, etc.
Put another way, they make trade-offs in life that result in success. As to what they give up...it depends on the person and their circumstances, but very often they are giving up peace of mind, free time (leisure), relationships, happiness, and sometimes even their health. But delayed gratification and long-term focus (long-term trading-off) seem like key elements to success. I don't view that as just luck.
The anecdote of the fund manager who was less successful in China from the article stood out to me as logically flawed. This later failure in a different time, a different market, does not mean the person's prior success was due to mere luck. The world has changed a lot (for example advent of the Internet and digital trading) and China is also a very different place. It could be simply that this person was no longer in a position where they've made the right trade-offs to be relatively competitive in the new set of circumstances years after their "prime". And it might even be a conscious choice - it is easier to make some trade-offs when you are younger (better health, more energy, lack of familial obligations, etc.) and as we get older and our priorities change, we're less likely to make some of those trade-offs (not always, but typically). But I don't think it makes logical sense to cast prior success as luck due to later failure - the causality there is spurious, at best.