"Child Actors" are more an exception. You can train a million children on the books of harry potter, only 3 or 4 will be good enough to be actors. The children that "made it" did so from grit and passion (or other traits) but very little from that reading of 10-20 books.

The AI that reads the books, and can do what LLMs do, are guaranteed to sold for billions in API calls.