This. Dealing with the problems of a real-world legacy code base is the exact opposite of a perfectly constrained problem, verified for internal consistency probably by computers and humans, of all things, and presented neatly in a single PDF. There are dozens, if not 100s, of assumptions that humans are going to make while solving a problem (i.e., make sure you don't crash the website on your first day at work!) that an LLM is not going to. Similar to why, despite all its hype, Waymo cars are still being supervised by human drivers nearly 100% of the time and can't even park themselves regularly without stalling with no explanation.