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No. If you want an em dash, you can use the HTML entity as you stated or just use the Unicode character. People who really want an em dash have figured out what they need to do to get it. People wh...
Answer
#1: Initial revision
No. If you want an em dash, you can use the HTML entity as you stated or just use the Unicode character. People who *really* want an em dash have figured out what they need to do to get it. People who use `--` for em dash are presumably used to and fine with it being rendered as "--". Everyone else, which I expect to be the more common case, would just be caught off guard by this leading to confusion and frustration.