That only works with very small projects to the point where the specification document is a very large percentage of the total code.

If you are very experienced, you won’t solve the problem differently day to day. You probably would with a 10 year difference, but you won’t ever be running the next model 10 years out (even if the technology matures), so there’s no point in doing that comparison. Solving the same problem with the same constraints in radically different ways day to day comes from inexperience (unless you’re exploring and doing it on purpose).

Calling what LLMs do hallucinations and comparing it to human mythology is stretching the analogy into absurdity.