We use AI to write almost all our code in a fintech - trading applications. If the quality is low, bugs cause monetary loss. Degradation in performance causes monetary loss. And so on.

It doesn't happen. We have very good functional and non-functional testing and the coding agents are able to iteratively add functionality correct features and improve performance.

I don't understand what other people are doing different to get worse results. We cannot ever go back to humans writing this code, because our competitors will eat our lunch if we do.