If I found the best human writer in the world, and had him write every article on the internet, wiping his memory between each one, his writing would start to get pretty noticeable and boring!

If that writer had consumed terabytes of text, and in spite of not perfectly memorizing all of it could quite accurately predict the next word from a sample of it, and still couldn't vary their word choice and sentence structure, something would be wrong.

I agree. LLMs write really well, but probably too consistently in terms of style. That said, I did recently ask AI to do an editing pass over some writing I did, and I was surprised that it missed a tense mismatch that I had (not within a sentence, but within a paragraph).