I would argue that generative AI in the hands of an already skilled developer is equivalent to the mill scenario. One person's expertise leveraged by way of this tool can allow for output that is orders of magnitude greater. The mere inertia of the "machine" encourages more productivity than otherwise. It is almost as if it is pulling you forward when you use it properly. Knowing when not to use it is also very important.
The concerns over hallucinatory output do not seem as relevant to me in this scenario of highly-skilled milling machine operator. You expose yourself to something for 10k+ hours and you will immediately recognize when it does something funny. Novices will cause trouble in any domain regardless of quirks in their tools. I don't think lack of experience should be conflated with hallucinations when evaluating the impact these tools might have at large.