Adult intelligence (g, IQ, whatever) (which predicts most of the things we’re taking about) is thought to be about 70-90% genetically heritable. Most of the rest isn’t known (maybe effectively random).
What's the simplest explanation? There's a specific gene for each and every human activity that causes extraordinary natural ability in that activity, or that there isn't and ability/results are more of a function of things like practice, discipline, and immersion at a young age?