There's an implicit assumption that humans will get things wrong, which is why we invented pull requests, code reviews, design sessions, unit tests (with separate reviews for those), etc.

The belief that AI can do all that without the gates is throwing away something useful where people get to understand how the system is changing. If you keep the gates but use AI to generate all the code you either slow AI down to the speed of humans or you end up with a massive backlog of stuff to review.

This is a hard problem.