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I'd say the culprit is not em-dashes, but the "simpleminded line-wrap".
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This is true but we have to work with what we got.
I too, always insert a space before and after an em dash except where it occurs at the end of a sentence.
I believe en dashes are used to show a range of something so should not be used instead of an em dash.
Ellipses can also be a problem and I find publishers are inconsistent when using them. I do a search and replace with a space after them. Again, no need for a space at the end of a sentence.