At least in a liberal society humans matter. Their opinions, judgements, tastes matter. Why should "opinion" (which is not even a real opinion) of a machine matter?

Not to say that we validate whether to trust an opinion of a human expert by them being able to deliver measurably correct judgements, the same thing LLM seem to be not good at.

You can't measure the results of your legal advice in most cases. There are all manner of things we can't measure well. We don't throw up our hands and say "then forget it". We do our best with the anecdotes and move forward.