It is more useful to think about it in terms of what that effort actually entails.
If you haven't ever written a novel, or even a short story, you cannot possibly imagine how much of your own weird self ends up in it, and that is a huge part of what will make it interesting for people to read. You can also express ideas as subtext, through the application of technique and structure. I have never reached this level with any form of visual art but I imagine it's largely the same.
A prompt, or even a series of prompts, simply cannot encode such a rich payload. Another thing artists understand is that ideas are cheap and execution is everything; in practice, everything people are getting out of these AI tools is founded on a cheap idea and built from an averaging of everything the AI was trained on. There is nothing interesting in there, nothing unique, nothing more than superficially personal; just more of the most generic version of what you think you want. And I think a lot of people are finding that that isn't, in fact, what they want.
At the very least, art usually contains effort signifiers. Yes, an artist could potentially employ gingerbread men cut from construction paper in a work, but no, construction paper gingerbread men are typically not in the same league as David.
