'field maturity' could perhaps say something about the likeliness of trustworthy information/advice overall, but says nothing about the trustworthiness of the expert themselves.

in fact, the nominative 'expert' is a political injection, practically begging for appeal to authority to shut down critical thinking. expertise has little correlation to trustworthiness, given that it typically gets overwhelmed by the politically-interwined 'esteem'.

there is no shortcut to doing the hard work of triangulating the best information out of many biased opinions, including so-called 'experts'[0]. this is true of news, reviews, and commentary of all sorts.

[0]: similarly noted in a different context here, along with it's grandparent comment: https://news.ycombinator.com/item?id=29678221