Sure, but it's always both in large scale human endeavor. We're not talking about virtuosic performance that is more or less the direct result of talent + obsessive practice. That's why I'm equally uninterested in those who claim it's all luck as those who worship and hang on every word of prominent tech billionaires. I'm more interested in applying human agency than trying to come up with a theory for success—the latter is inevitably biased navel-gazing.