I agree, and I think it's related to the Dunning Kruger effect. The more you know, the more you realize all the things which you don't know.
There's also a bit of a vicious feedback loop; often people are unwilling to admit that they don't know something because they don't want to appear weak. But until they admit it, they'll always be deficient in that subject.
There's also a bit of a vicious feedback loop; often people are unwilling to admit that they don't know something because they don't want to appear weak. But until they admit it, they'll always be deficient in that subject.