But I can completely believe that someone who knows the code by heart would have a better signal to noise ratio on their reviews.
I'm trying to find the sweet spot because I've found some NASTY bugs Claude missed, and also had Claude find some nasty ones for me. And this is in codebases with tens-of-thousands of AI-generated lines of code + AI-driven reviews. So I want to bring both to the table.
The existence of some of these major "oh man that changes a lot of our assumptions" bugs that were only found because someone poked on the agent and said "I don't think you're paying enough attention to this" justifies that, IME.
And the better you are at pointing the agent at the truly-important parts, the better the agent's gonna be at finding shit you missed.