Yes, that is a serious skill. How many of the woes that we see is because people don't know what they want or are unable to describe it in such a way that others understand it.
I believe prompt engineer to properly convey how complex communication can be, when interacting with a multitude of perspectives, world views, assumptions, presumptions etc.
I believe it works well to counter the over-confidence that people have, from not paying attention to what gaps exist between what is said and what is meant.