after 5 mins talking to an LLM about said field.

The insidious thing is that LLMs tend to be pretty good at 5-minute initial impressions. I've seen repeatedly people looking to eval LLM and they generally fall back to "ok, if this were a human, I'd ask a few job interview questions, well known enough so they have a shot at answering, but tricky enough to show they actually know the field".

As an example, a colleague became a true believer after being directed by management to evaluate it. He decided to ask it "generate a utility to take in a series of numbers from a file and sort them and report the min, max, mean, median, mode, and standard deviation". And it did so instantly, with "only one mistake". Then he tried the exact same question later in the day and it happened not to make that mistake and he concluded that it must have 'learned' how to do it in the last couple of hours, of course that's not how it works, there's just a bit of probabilistic stuff and any perturbation of the prompt could produce unexpected variation, but he doesn't know that...

Note that management frequently never makes it beyond tutorial/interview question fodder in terms of the technical aspect of their teams, and you get to see how they might tank their companies because the LLMs "interview well".