I've been using compose keys on desktop operating systems and the default keyboard on Android to write em-dashes for 10 years. I also use LLMs every workday, but I have never once used one to write, review, or edit prose because my voice is important to me.
I don't give a shit if my Hacker News comments sometimes look "suspect" to some people. The way I use language is deeply personal and I'm not going to let the clankers or reactionaries against them take it away from me.