I like this train of thought. I wonder if "text in prompt" is far too simplistic of an interface as an input to a black box to consider skill level with?

My inclination is to say the interface needs more breadth of options beyond single-line string input, and the outcome needs to have some level of predictability to enable the artist a significant enough level of understanding of how each aspect of their input alters the output.

I mean, the input parameters should be complex enough to let artist intentionally develop a unique style/idea, rather than style being dictated inside the black box.