The system works because responsibility sits with the submitter

The real invariant is responsibility: if you submit a patch, you own it. You should understand it, be able to defend the design choices, and maintain it if needed

I think framing it as a trust question is exactly right

Accessibility is an angle that rarely comes up in these debates and it's a strong one

The quality argument against LLM-generated code has always seemed weak to me. Maintainers already review patches because humans routinely submit bad code. The review process is the filter.