"Let's identify specific, clear areas for improvement, and if they are not able to improve, let's fire them": it's as simple as that.
Teaching a human with motivation, potential and desire to learn is both easier, and more rewarding (for most humans), than attempting to teach LLM to write good code every time — humans tend to value their personal experiences more, whereas LLM relies more on the training corpus. So when I've seen people massage LLM output to be decent or excellent, it took them more time than it would have taken for them to write it from scratch without an LLM.
Which makes LLMs mostly a curiosity, and not a productivity booster. Can it get there? I hope it can, because that would be amazing.