For example, a person with a PhD in history will probably be a good writer and researcher, but may need a couple of years training and experience before they're an amazing journalist, for example, and may only be OK at PR, even after a couple of years. If you want PR 'talent' then the history PhDs would not be very helpful.
A bio PhD would be amazing at many things, but would probably suck as a nurse.
So it's not just the raw talent, but also training and inclination.