How has expert knowledge changed?

Question

How has expert knowledge changed?

Answer 1

People are now experts only in a narrow band of knowledge, rather than masters of an entire discipline.

For example, most physicians specialize in very specific aspects within the medical sciences.

They now tend to have a deep knowledge in a narrow field rather than a shallow knowledge in a broad field.

Answer 2

Now everyone considers themselves to be an expert if they merely read an article about something...experts make me tired...