It depends on the keyboard, and the software. I’m using HeliBoard on my phone right now, and all I have to do to make an em dash is hold the dash key—that’s it. It’s actually quite trivial to add em dashes in various cases, and I wish folks wouldn’t pretend otherwise.

I also make use of other characters, like my beloved interrobang. I actually have that pinned to my clipboard, so I can paste it when it’s appropriate.

“You care about writing enough to use special characters‽”

“Yes.”