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I feel like a lot of these have been LinkedIn-isms or PR-isms long before they have been AI-isms so not much is lost.

I used to use em-dashes for explanatory clauses--like this one, for example--when using commas would make the sentence difficult to parse due to other nearby commas.

They're only a LinkedIn-ism when used to create an unduly dramatic juxtaposition for an otherwise mundane idea. But now they set off people's AI radar when used for any reason at all.

Perhaps I am biased because I find the use of em-dashes without spaces (as is common in English typesetting) to be inherently ugly so I'm not too unhappy to see their use discouraged.

Same here. I was always more of an en-dash enjoyer, and used that back in academia since it's just a double-dash in Latex.

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