That people assume proper use of punctuation and clear writing are signals of AI just tells you about the sorry state of education. And it’s only going downhills from here.
I’m torn here — first instinct is to agree. But then maybe we’re just prescriptivists complaining about the kids not doing language right, like when people insist that some archaic meaning of a word is the “real” one. Maybe it’s just evolution of language and AI is writing in an older style because of training data?