It would be horrible to rewrite. Not the first commit or whatever. But after a few weeks of people not reading the code it looks more like a write only code base. I refused to go full vibe/agentic coding. So I got to see what was happening. This was only over a short period of time mind you.

There was a lot of duplicate and triplicate methods. A lot of the classes were is-a related without inheritance, not the biggest deal but it was becoming a mess.

Code I used to know well was more or less gone. It was rewritten in a way that wasn't the same approach and had lost lessons learned. Some of it had real battle wounds baked into it. Things qa passed the week before were broken in places no one thought they touched. A good deal of tests were useless or didn't mean anything for production.

Code review is more or less impossible for me. I can read maybe a 1k line change. 20-30k changes all the time? You end up saying "sure buddy lgtm". We had someone put a 200kloc change for a new feature using a 3rd party tool no one had used before. No clue, but it was not my business apparently because we needed to be more individuals now that we were using AI