[macintux]

I am annoyed that correct use of punctuation is now considered a red flag.

[eterm]

Like all punctuation: it's a choice.

One that has made it's way into LLMs because they've injested a lot of actual books that were professionally type-set.

Humans typing online don't tend to use em-dash; LLMs often make the choice to do so.

That makes it a very strong signal.