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Know the rules, fight the rules, I guess. More readable, but I’ve since regressed as tooling comes into play. Maybe it’s a good way to still use ems and differentiate from AI.
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Looks and readability matter in writing. I always uses spaces on either side of the em-dash; looks too crowded otherwise to my eye.

I've been doing doing it that way for so long I still often use the "--" construct from way back in ascii email days.

At least I've gotten past the two-spaces after a period I learned from the typewriter. Most of the time, anyway.

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To me it doesn't affect readability either way, but to my American English eye the surrounding spaces stands out as extremely non-standard.
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Every AI response I've seen that uses em dashes also includes spaces around them.
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DFW famously put spaces around his em dashes. That being said I've noticed at least one major model seems to have started putting spaces around its em dashes.
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