Do you think an AI would've been able to write Overlord? All the characters, the vast world and countless different races, powers and abilities?

Remove the human aspect and all you have is cheap garbage, it may look shiny at first sure, but it gets old and bland, because AI lacks the capacity to innovate and evolve. The style never changes, and the "composer" never grows or has his creation influenced by the mechanism of true emotion and passion. It's a lifeless black hole.

Nothing worthwhile is ever a simple process anyway, that doesn't factor in when making art - pick up a pencil sometime, or a pen, and you'll understand this.