A book?

You can’t ask a book for clarification, or to fill the gaps it leaves.

I agree, but it does give you access to field experts. Presumably a good book covers the learning approach in whichever way they consider it best, from the position of a field expert. It's also vetted information by other field experts. At the moment, ChatGPT's answers are between ChatGPT and the asker. It can be a total hallucination or useful information. By the way, my point is just that access to experts is not that hard if you consider their books as access.