A feature wasn't 10000 loc written by a AI before that no one except the AI with the context understands. If you review all that to understand it fully your productivity gain diminishes, the gain might not go away fully but it is much less when you can be woken up at 3am because of an incident and start reviewing everything.
Well, for me it makes a difference. I often get in a sense a "theory of mind" of the other developers when I read other code. I don't get the same thing with AI code.
Well you aren't writing the code, the AI is and you are letting the AI debug that created it in the first place and it doesn't learn from the experience in the same way. Hopefully you understand the problem in such a degree that you can spec away the problem in the next iteration. I'm seeing that issue now, people just forget to learn what the issue is and keep repeating mistakes that are regurgitated from the training material.