Comment by matt_kantor

"Ruining" in the sense that "I worry that when I [use em dashes] people will assume my writing is LLM output".

I'd feel the same if I was someone who naturally frequently used phrases like "you're absolutely right", or for a much more extreme analogy: if I was a Hindu living in Europe in the 1920s and then the Nazis came along and "ruined" the swastika for me.