Expertise is not fungible.

You can know an immense amount about a subject, even dozens of subjects, and still be utterly ignorant and prone to logical errors and biases in other subjects. And this is something people forget a lot. We assume that because someone is learned or accomplished in one area, they must have good judgment across the board.

Sometimes, in fact, the process of learning one subject super well means a person was very intellectually or culturally isolated from other types of knowledge. A great example of this is medicine. Medical doctors know a lot about applied, real world biology, a plethora of technical skills, and a staggering amount about anatomy.

Do they understand the philosophy of science super well? In most cases, no.. Do they understand statistics and odds ratios? No. Are they well trained in how to conduct good research? Mostly no. Do they have any education at all in the humanities? In most cases no. Do they have training about racial, gender, and ableist biases that might negatively affect their practice? No. They had to master a very specific (yet voluminous) body of knowledge…and that may have come at the expense of other learning opportunities.