Comment by spoiler

The thing is, the development timeline is so compressed that you lose intimate knowledge of the codebase. Like, I don't think humans can form memories that detailed that quickly? Maybe it's just a me problem though. Anyway, so when you need to debug or fix stuff, AI's reasoning will be "welp makes sense, I suppose" and your mental mood of the codebase is now slippery. Eventually there comes a time where at best you can draw an incoherent high-level diagram of the architecture.

And AIs solution to problem is generally "more of the same" to fix it. It rarely looks at fixing design problems