Both of the examples you gave both fall under "a special keystroke combination," which I did list. Typing "--" is two keystrokes compared to one for an en-dash.
The iOS example isn't just "long press the hyphen" it's "press the [123] button, long press the hyphen, and slide your finger over the em-dash" compared to "press the [123] button, long press the hyphen" for the en-dash.
If you're going to argue at least be genuine. I didn't say it was hard to type an em-dash, I showed that every way to get an em-dash into your writing takes an extra step. Taking an extra step compared to other characters means it isn't trivial.
For someone writing publication quality work, em-dashes appear and if I see an em-dash in a book I don't assume AI writing. But for comments on the internet or a blog posts that aren't meticulous everywhere else, an en-dash is a pretty good signal that the work is AI generated. When people are writing, needing an extra step to insert an em-dash is disruptive to most people's train of thought.
