I got an LLM to analyse all of my messages and e-mails from the launch of gmail to work out my writing style, it says I heavily favour em-dash's. I used to work in the industry of type settings and press and publishing. I even use — in HTML when I have to write it nowadays. em-dash is not a LLM thing. It's just most people don't know how to use it. It also said I'm wry. Go figure.