I have only seen AI make codebases better, and I'm talking about it making some pretty nuanced changes. I think mass-rewriting of projects is possible these days with AI.
just last week AI led a developer on our team to brick our git history when he was attempting to fix a deploy. he's not a git expert but an llm should of not led him that far astray, no?
i see on a weekly basis where if an llm was left to do what its initial direction was without human oversight it would have broken otherwise working programs
it was related to a deploy issue not a PR and he's the sole developer on a small team, i just consult part time. the example is less relevant; we are seeing developer delegate their understanding to the confidence of an LLM