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What would be the inate qualities a poker player could have, that even the most driven couldn't replicate ?
Concentration level. Ability to perceive minute changes in people's behaviour and actions. Ability to process various types of information effectively in order to come to a decision, especially under duress.
Even the desire to improve is something that varies greatly in individuals - some of us desperately want to get better at poker, others are content with their skills as they are.
Given desire, we can all get better at these things, but perhaps only to a certain point before diminishing returns set in. As well, the speed of development will differ and this matters because we only have a finite number of hours on this earth.