Napolean Hill said that 95% of the population are failures

Why?

He says it's because they have not found their niche in the world's work

This was in the 1920s

I think it's likely now closer to 99% of the population

And the sad thing is that there's never been more opportunity to find a niche and make a living from it

Why is it so difficult for most to find what they're best at and simply do that?