Think of it more as "prompt-fu", akin to "google-fu"--or how to google. You do have to know how to talk to an LLM, and it will be important. But it's not so much engineering, as we come to think of it in software traditionally. I wouldn't get hung up on the name, but just see it for what it is--a bad name for something we'll need to learn to be effective. It won't go away entirely, but will be mitigated to be less important as LLMs and AI get better.
Prompt engineering has been fascinating to follow at my job. People believe that they will be using "prompt engineering" as a new way to verbally interact with peers. As if they now have found the Rosetta stone for their own quirks.