For me, if I want to go for breadth (quantity), AI is fine. For depth (quality), I have to come up with it or commission someone really skilled at their work.
I take Elder Scrolls II: Daggerfall as an example. The massive scale of its world map was ultimately procedurally-generated (i.e. AI). The locations important to the main quest was hand-crafted and generally of better quality.
The value of art is in the choices you’ve made and why. It’s important to keep this in mind with AI; how you choose to use it should mesh with your vision. Knowing your own strengths and weaknesses is hard enough, but now we must also know the AI’s, if it can truly help us.
For a criminal organization operating a towpath racket, an LLM once proved interesting in generating a rudimentary business plan for it and speculating various knock on effects of the racket. I had to give it a great deal of context and carefully choose which ideas to use, but if you make its outputs your own thoroughly enough, it can be a useful tool.