LLMs don't "come up with writing," they scrape writing that's already been written by humans and barf it back to you based on other writing composed by other humans. They are plagiarism machines. If you are using the plagiarism machine, you should absolutely disclose that, then jump into the sea.
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Though, also, a wizard would never!
One member tried to get me to use an LLM for the rough draft, and his points were good, but I want to become a better writer.
LLMs have their uses, but they also can rob you of the benefits of practice