@Strandjunker A.I. trained on properly edited books. The use of em or en dashes comes from that training. A.I. didn't just "decide" they are cool and start using them. Their use simply indicates that the content is either properly edited (at least minimally so) or based on properly edited text.

(Edit to add note: this should read as me 100% agreeing with you, not my trying to inform or correct you)