Personally, my feeling is that some of the difference is accounted for by senior devs who are applying their experience in code review and testing to the genera

Personally, my feeling is that some of the difference is accounted for by senior devs who are applying their experience in code review and testing to the generated code and are therefore spending more time pushing back asking for changes, rejecting bad generations and taking time to implement tests to ensure the new code or refactor works as expected. The junior devs are seeing more throughput because they are working on tasks that are easier for the LLM to do right or making the mistake of accepting the first draft because it LGTM. There is skill involved in using generative code models and it’s the same skill you need for delegating work to others and integrating solutions from multiple authors into a cohesive system.