I think the point is that your expertise doesn't grow linearly with the amount of time you spend. It might take you 10,000 hours to find yourself in the top 5%

I think the point is that your expertise doesn't grow linearly with the amount of time you spend. It might take you 10,000 hours to find yourself in the top 5% of the population for a particular skill, but you can maybe get to the top quartile in 100 hours, which is probably good enough.