Write a good high level plan with functional and non-functional requirements and it works out costing less, works more efficiently, and no surprises.

It’s like this: If you know the right words to say to the LLM, you’ll likely get back the “right words” also. And the more right words up front, the less steering you need to do.

(Having 20yrs of experience writing these user stories and designs help, my “unfair” advantage)