My current policy on this is that if text expresses opinions or has "I" pronouns attached to it then it's written by me. I don't let LLMs speak for me in this way.

I'll let an LLM update code documentation or even write a README for my project but I'll edit that to ensure it doesn't express opinions or say things like "This is designed to help make code easier to maintain" - because that's an expression of a rationale that the LLM just made up.

I use LLMs to proofread text I publish on my blog. I just shared my current prompt for that here: https://simonwillison.net/guides/agentic-engineering-pattern...