I've tried to use real hyphens and dashes since learning a bit about typography roughly 10–15 years ago. macOS makes it really easy with just alt and hyphen for en-dash, shift+alt and hyphen for em-dash. Definitely not an "obvious tell" of an LLM!
Thanks for the '⇧⌥<dash>' tip— from 2022–2025, I have been using macOS en's thinking they were em's.
(Side note: GTP says apostrophes should be used for pluralizing only for single letters to avoid confusion, but this seems more readable than "ens and ems" IMO.)