[mncharity]

I suggest people badly underestimate how very rapidly expertise falls of as one moves away from a specific tightly-scoped feedback-intensive area of skill. Ask a wizzy quantum chemist a protein chemistry question, and don't be surprised to get the answer of a grad or undergrad student. There's a news genre of "Harvard MBA's don't understand seasons!"-like stories - if someone last saw something years ago in middle school, don't be surprised now by a middle schooler's understanding. A person can both be a highly-regarded <model organism> researcher, and have gone rather nutter on <diet thing> that very isn't their research area.

Physicists are stereotypically famous for misjudging expertise decay. https://xkcd.com/793/ Some things, like deep intellectual humility, do seem to consistently transfer well between fields. Being "right, a lot", not so consistently.