It's quite a stretch to go from an argument on distributions to an argument on the best marginal use of ones time. Those in the right of the log normal curve ha

It's quite a stretch to go from an argument on distributions to an argument on the best marginal use of ones time. Those in the right of the log normal curve have had to learn their skill as well. It's all about trade offs. The regular advice I've learned is to improve your primary skill until you are a professional senior, then expand your skills. And even that then goes against the popular Federer story who started in other sports and whose tennis teaching mother wouldn't teach him!