> Even on teams of experts, this type of issue would take someone really capable weeks to track down, especially because the repro environment is hard to obtain.

> As a system becomes mature, the bugs become harder and harder individually to track down.

What I'm talking about is that experts knows the system mechanism more than amateurs, so any hypothesis and experimental setup will be more focused and thus more economical than any amateurish one. And there's the matter of knowledge not present in some docs or other forms, such as past experiences.

Even with LLM tooling, we've seen the rises of harnesses and helper tools instead of relying on generation for everything. Who would you trust to build such harness, a domain experts or some random guy off the street?