I'm not sure people should be concerned how the document is produced if it is otherwise coherent and readable. Not that this applies in places where producing the document yourself is the point. If someone sent me an email and an AI had written it, if I otherwise couldn't pick up on it being AI I wouldn't care, and writing can be bad or awkward without being AI. And if it was spam, I would dislike it for being spam, not for being written by a large language model.