I'd put it as, the very best writing can just use a lot of simple, declarative sentences. Decent, not extraordinary writing may need a few such constructs to take the reader in the direction the author intend. And you can use these constructs in a sort-of "poetic" way if you want to land in the land of conceptionality or something.
But the key thing is that with AIs, their output is subtly wrong everywhere, in a way that most human action doesn't follow (usually coherent syntax implies coherent semantics but not so much with AI). And so there really isn't good glue-phrase to use keep those semi-thoughts together.
...and you're right, it's not the idiosyncrasies, it's the fluffy meandering meaningless purposeless vapidity.