I think some people who are better at "prompting" even without domain knowledge could be better at getting LLM agents to produce good results than people with good domain knowledge but without the skills to prompt well. Just a hypothesis though, would be fun to try it out for real sometime :)
Pit two people with different "prompt engineering" familiarity against each other in real-time, with the same goal, see who builds the best thing, judged by other human experts.