Easy way to start: ask AI to make the codebase more robust. Modern models are quite good at finding areas of fragility.

So many of these complaints suggest that people are accepting that the first attempt by a model is the best it can possibly do. Yes, it takes effort to guide and correct the model's output, but not that much effort.

You may not want that to be your job, which I understand. And AI isn't great at everything, and has gaps, etc. But if you are going to give AI a fair shot, don't hamstring it by using it poorly and then claiming your bad results are representative.