But there is so much context that the LLM has no access to. Implicit assumptions in the system, undocumented workflows, hard edge cases, acceptable bugs and workarounds, Peter principle boundaries, etc... All these trade-offs need someone that understands the entire business domain, the imperfect users, the system' implementation and invariants, the company's politics and so much more. I have never encountered a single programmer, no matter intelligence and seniority, that could be onboarded on a project simply by looking at the code.