This is a pointless and infinitely losing arms race. LLMs will learn to use hyphens instead of em dashes, and so what? You’re going to start using em dashes again?

Just focus on not producing slop.

At this point, I believe the LLM "style" is on purpose. Perhaps the labs want to be able to distinguish their slop from human content for future training; I don't know. But it feels very deliberate that they've kept the style so consistent for so long.

I agree. They're voluntarily adding fingerprints to images so I expect the default voice is intentional and it wouldn't surprise me at all (though I have no evidence of this) if the output text has a fingerprint stenographically embedded in it.