Based on my experience with using AI for development work, it feels like you really need to work with it instead of expecting it to do the work for you. Rather than type the code yourself by hand, you now need to explain the task very clearly, then review or test the generated code and then ask it to refactor and fix the issues you identify. This in itself is work that needs to be done, a different way of working compared to manual coding, but that doesn't mean any significant overall productivity gains are always guaranteed.