As someone who reads poetry regularly and has played around a bit with AI-generated poems, AI poems can be quite impressive, but have a certain blandness to them. I can see them conforming very well to the average person's concept of what a poem is, whereas the human written poems might be less pleasingly perfect and average, more stylistically and structurally experimental etc. The LLM version is less likely to play with the rules and expectations for the medium, and more likely to produce something average and "correct", which makes some intuitive sense given the way it works.