Because it's just cope. Look at the current reality. Are companies rushing to fix bad or even buggy code written by human devs? No, not in most cases. In most cases, if a piece of code "works", it is left the hell alone. And that's the thing about AI code: it does work. The quality is irrelevant in the overwhelming majority of cases (especially if it's other AIs that are adding to it, which is the case more and more often).