AI coding tools are optimising the wrong thing and nobody wants to hear it. Writing code was already fast. The bottleneck is everything else: unclear requirements, review queues, terrified deploy cultures, and an org chart that needs six meetings to decide what colour the button should be.
In my experience, the biggest problem with AI-written code is that is is full of hidden bugs that are near impossible to track down, because the code is virtually unreadable. Basically, you deploy faster and spend a lot more time with catastrophic failures you have to root out, only to find out that the fixes to the issues cause more issues downstream, because nobody know what anything does anymore.