That is a very detailed and interesting analysis. Thanks for the time to create and share it ... very insightful.
About my only thought is that (at the risk of being presumptuous) many of the AI lyrics I've read sound like Victorian poetry. Primarily meaning that IMO frequently the lines are structured primarily to place a needed rhyme word at the end. Often, i.e., not always, the narrative leans to the pedestrian (the adjective not the noun

) side of writing .. again IMO.
I do get the "break through writer's block" thing and the help it can offer new writers. And, hey, I'm light years from being a great lyricist so a boatload of salt is offered with these comments. 😀 And at the speed this technology is advancing they may be writing with the best of the best in a few months. 🤷♂️
Bud