Let me try to steelman instead: my hypothesis is that copywriting for marketing emails A) has little value and B) can be done by humans much more cheaply than $

Let me try to steelman instead: my hypothesis is that copywriting for marketing emails A) has little value and B) can be done by humans much more cheaply than $80/hr. In regards to B), I know there are people doing that job that make a fraction of that wage. Is the author that much faster or does the author write "better" text? I'm skeptical of "better" because of A). But maybe someone has A/B tested marketing emails and can tell us that the text makes a difference?