The main limitation on it now is not in the generation, but the interface. Verbal prompts are fine if you really don't know what you want, but they just give you a generic output. Going I2I or anything of that sort, you're making or borrowing human art and then asking the AI "could you make it pretty for me?"

It's a question of what information the image actually encodes. The part that "tells a thousand words" in an illustrative sense, you still have to make.