It honestly just seems like you want AI to be a stand in for creative thinking and intention rather than it actually enabling creative processes. Your examples you provide don't teach those skills. Everyone has ideas. I have ideas of being a master painter creating incredible paintings, I can visually imagine them in my head, AI can shit out something that somewhat resembles that I want. It can train on my own style of [insert medium]. But I am always at the mercy of the output of that tool. It would not be a problem if it were a normal tool like a camera or paintbrush. But when you use a thought limiting tool like AI it gives you limited results in return. It is always going to be chained to the whatever that particular AI has trained on. Artists develop a style over years, it changes from day to day, year to year, AI cannot evolve, yet an artist's style does just through repetition of creation. AI creates the predictive average of existing works.
I think the biggest thing here is that AI is a limited tool from the ground up rather than enabling creativity. You can't train AI to develop a new concept or a new idea, that's reserved to humans alone. It's that human intangibility that's yet to be achieved via AI and until sentience is achieved you're never going to get that from a limited tool like AI. If sentience is achieved, you'd have to recognize its humanity and at that point prompts are no longer needed, it can create its own work.