Earlier quoted context omitted.
Same thing as with em dashes. Some of us have been using em dashes from before ChatGPT.
Genuine question, do you actually use the formal emdash in your writing? AIs are very consistent about using the proper emdash—a double long dash with no spaces around it, whereas humans almost always tend to use a slang version - a single dash with spaces around it. That's because most keyboards don't have an emdash key, and few people even know how to produce an actual emdash. That's what makes it such a good givea…
Being able to insert self-interjections and such with the correct character would undoubtedly be more widespread if it were more accessible to insert for most.