Not implying your comment is LLM generated, clearly it isn't but asking as a genuine question.
Typography nerds, which are likely overrepresented on HN, love both em dash and en dash, and we especially love knowing when to use each. Punctation geeks, too! If you know what an octothorp or an interrobang are, you've probably been using em dashes for a long time.
Folks who didn't know what an em dash was by name are now experiencing the Baader-Meinhof phenomenon en masse. I've literally had to disable my "--" autocorrect just to not be accused of using an LLM when writing. It's annoying.