En dash is all over the place in personal/business writing, even just in email, thanks to Word and Outlook autocorrecting a hyphen to an en dash whenever it's between two spaces (rightfully in my opinion). If you've never seen it then that surely says more about what you notice than the content of what you've read.
That doesn't necessarily contradict your point – if you never notice the distinction then what's the point? But it's different from how I read the implication of your post.
(Funnily enough, without thinking, I put an en dash in the paragraph above by holding down on hyphen in the Android keyboard, and only caught myself after I did it.)