You cannot trust AI. So, if you build an app, and you don't know how it works, you cannot release it. Therefore, you spend time reading code that was written by a machine that doesn't make a lot of sense which is similar to reading code by inexperienced programmers. Hence, the only thing cut out of the equation is inexperienced programmers which have been replaced by something that cannot explain to you what it did reliably. That, it turns out, is going to take up more time, not less.