Technically that's known as "LLM-as-judge" and it's all over the literature. The intuition would be that the capability to choose between two candidates doesn't exactly overlap with the ability to generate either one of them from scratch. It's a bit like how (half of) generative adversarial networks work.

s/AI/tech

I suspect this will indeed be part of it, but it won't work with today's AIs on today's codebases.

Models will improve, but also I predict code style and architecture will evolve towards something easier for machine review.

Agents could generate more PRs in a weekend than my team could code review in a month.

Initially we can absolutely just review them like any other PR, but at some point code review will be the bottleneck.