President is a title here so Capitalization is correct use. That last one wasn’t. To be pedantic, we all know which one I was referring to.
I still like ‘em!
2.) I'm comfortable with varied comma stylization.
3.) My personal usage of the em-dash hasn't changed in a few decades and I don't see it doing so just because a bunch of folks only just recently learned it exists.
Your bio contains comma splice, by the way.