And your point about humans lying about knowledge only to be found inexperienced is quite the opposite of an LLM (albeit there is the hallucination problem, but GPT-4 is a massive improvement there):
These models do have “experience” aka their training data. And I would argue with most every one of your examples of things that GPT doesn’t know.
You can ask it about performance implications, side effects, costs. It’s quite good at all that right now even! Imagine the future just a few years out.