IME, in prose writing, arguing with LLM can help a newer writer to gather 'the facts' (to help with research) and 'the objections to the facts' (same result) to anticipate an initial approach to the material. This can save a lot of organizational time. After which, newer writer can more confidently approach topics in their own voice.

If AI wrote and thought better by default then I wouldn't have to read the AI slop my co-workers send me.