tl;dr: Martin Fowler argues that LLM-generated prose has a detectable "voice" that triggers an uncanny-valley reaction, and even human editing of LLM drafts rarely removes it—so writers should avoid using LLMs to draft or restructure their work. He warns that outsourcing writing to LLMs also means outsourcing thinking, which undermines both skill development and comprehension. He allows exceptions for accessibility (e.g., disability), translation, or bureaucratic writing no human will meaningfully read, but insists genuine human communication requires human-written prose.