I have a suspicion that most adults (75%+) could pick any skill—excluding sports—and work their way into the top 10% in the world simply by working exclusively on it every day for two years.
But almost nobody displays that degree of focus, so we will never know.
“There’s nothing I revile quite as much as a dilettante,” Seinfeld told GQ , “ I don’t like doing something to a mediocre level.” Escaping mediocrity requires focus. “You have to dedicate yourself to these great things,” he added. “And I don’t believe in being good at a lot of things—or even more than one.”
Doing more things does not drive faster or better results. Doing better things drives better results. Even more accurately, doing one thing as best you can drives better results.