Long ago on Windows I learned alt+0150 on the numpad.

Yet now my hard-earned attention to detail attracts nothing but false accusations...

Ain't no one got the time for that. How do you even know these things without looking them up?

If you like and use em dashes, you figure it out

I do. The point is that most people won't think about it, which is what we're talking about... There being a few outliers on a site called Hacker News who know the shortcuts for extended typography isn't in any way indicative of em dashes being in common use amongst phone users.

You spend a lot of time and money to study the humanities and have your work graded and corrected by picky professors.

Sure, but most people aren't humanities students. I feel the topic of conversation gets a bit lost in this thread at times.