Most of my work has been in core infra at large companies. Having the code written faster does not change rollout velocity all that much... It does help with signals and idiot proofing on bugs but when things break and cost real (very real) dollars AI is not an explanation. In that instance, its not even close. Development might be 10-20 percent of the actual work to get a change out.
To an extent it can help reduce wasteful steps. But there's nothing AI can do that can make it less irresponsible to reduce soak times, stagger the release across many environments, etc.
