Prompt engineering is just a fancy way of saying "rephrase the question until you get the answer you're looking for." People do that all the time when talking to each other. I don't see how better AI would change that.
It's the same story with search engines. Google et al may like to say they've tuned the engine to be "optimal" at guessing what people "really want." In practice, I've found the opposite to be the case. The damn thing interprets my query in such a liberal way that it returns a bunch of irrelevant garbage. Maybe their numbers show that this works better for the average person. But with people who really know what they're looking for (like me) it seems to have gotten far worse.