My AI content rules allow for a maximum of two em dashes for the article and never in a heading. Without that rule, I am often getting 8-12 of them in my draft. The em dash is a fine tool, but that is excessive.
Also, I disallow any use of the horizontal rule. I'll add them in manually, if needed. ChatGPT is the greatest offender for this one, often adding a <hr> before every <h2>.