That's still better than never being able to make an accurate confidence assessment. The fact that this is worse outside your expertise is a main reason why expertise is so valued in hiring decisions.
People only being willing to say they are unsure some of the time is still better than LLMs. I suppose, given that everything is outside of their area of expertise, it's very human of them.
Humans are also very confidently wrong a considerable portion of the time. Particularly about anything outside their direct expertise