You can spot AI writing now. Not because it's bad, but because it all sounds the same. Same cadence, same transitions, same careful optimistic closer.
The problem isn't tone. It's that your writing voice is made of dozens of interwoven patterns: sentence rhythm, punctuation habits, where your analogies come from, how you build and close an argument. A system prompt captures maybe 10% of that. The model smooths out the rest.
