Then seeing what guidance[0] is intended to do (LLM-prompt templating) it becomes obvious what people have in mind for this. It won't obviate understanding the lower-level code -- in fact, I expect the value of that skill to increase over time as fewer people bother to learn it -- but it will cut out the time it takes to scaffold an application.
This lack of reliability is often mentioned about these generative technologies. It seems to me that “how do I get the same T-Rex with lasers shooting out of its eyes but different color lasers?” and “how do I get the same JSON structure in my output and always only the JSON with no other text?” are roughly similar problems in “prompt engineering”.