The em-dash metric is silly. Some people (including me) have always used them and plan to continue to do so. I just pulled up some random articles by Wolfram from the before-LLM days and guess what: em-dashes everywhere. One sample from 2018 had 89 of them. Wolfram has always written in the same style (which, admittedly, can be a bit self-aggrandizing and verbose). It’s kinda weird to see people just blowing it off as AI slop just because of a —.