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Re:A few words about that ten-million-dollar serial comma (2... by bee_rider on Tuesday December 21, 2021 @05:23PM (#29642843)
Functionally, I guess the only advantage that the em-dash has is that it fails loudly and miserably when nested. For example:

Parentheticals -- already a bad -- although sometimes unavoidable -- habit of mine -- should never be nested.

Completely incomprehensible.

Parentheticals (already a bad (although sometimes unavoidable) habit of mine) should never be nested.

Dangerously comprehensible.

However, em-dashes do make the reading voice in my head change over to an old-timey radio announcer so that is cool.

Re:A few words about that ten-million-dollar serial comma (2... by cgriswald on Tuesday December 21, 2021 @06:32PM (#29643441)
> However, em-dashes do make the reading voice in my head change over to an old-timey radio announcer so that is cool.

That is cool.

When I read a parenthetical in parentheses it's like someone is talking to me while I'm trying to watch a movie: Even if the information is useful, it's annoyingly distracting. The same parenthetical in em-dash form doesn't have this same effect on me.

However—and I hope you'll bear with me here—for the most part the information in a parenthetical is either not needed or important enough to justify its own complete sentence.