they don't, cite one example of well written LLM prose? they can definitely infer a lot more slop than people have patience to, and anyone writing or reading slop prose has realised this and replaced sitting around writing and reading slop wiith llm's writing and reading slop and then grug-brains paste 10k words of slop say "grok, pls summarize, no mistakes" and grok tells them "What a brilliantly written article! ... "
Have you ever received an email from trades folk, in the days before LLMs? I'm not saying it's a better writer than Hemingway but very likely better than most your classmates.