tl;dr: Using AI to write substantive text is a bad idea because writing is inseparable from thinking—outsourcing it means skipping the reasoning that produces good ideas. AI-generated prose is also densely packed with subtle vagueness and errors that are hard to catch when passively reading but impossible to miss when writing yourself. Finally, publishing AI-written text without disclosure violates an implicit contract with readers, who expect the words to reflect the author's actual thought. Using AI for brainstorming, editing, transcription, or translation is fine; using it to generate the actual prose is not.