Never thought of it like this, that synthetic code doesn't need to get into a codebase for it to benefit from the discussion around what was encoded with LLM.

Yes it's a pretty well thought out policy. It feels bad for someone to put in a month of work and have their code ultimately rejected, but if an llm does something sloppy with some light guidance in a few days, then great, experiment with some weird stuff and see what happens, then once you know it probably should work, go in for that month of work and make it happen.