I have a few personal projects, i let codex do all the code - i do the thinking and testing.

One time, something didn't work as expected - its the first time it happened with this project. I read through the section of code and it was perfectly readable and well-written.

Turned out a plugin wasn't effecting the audio, so i just got it to pad some blank audio onto the beginning before processing it, then remove it at the end of the process. That fixed the issue, there was nothing wrong with the code but my ability to think laterally is what made it work.

We're getting to the stage where you can just ask them to write code and they will do what you want, and it writes good code. Its up to you to test everything beyond the internal tests it writes.