AFAIK closed em-dashes are the more widespreadly used version, and the fact that they are em-dashes gives away that they indicate no relations among the words t

AFAIK closed em-dashes are the more widespreadly used version, and the fact that they are em-dashes gives away that they indicate no relations among the words they separate. Though this is kind of a bikeshedding problem where people don't differentiate between a hyphen and anything else, and sentences result incomprehensible, or they trip you and you have to read and re-read them. Even many publishers just don't care. I'm actually content when people are kind enough to use something that's not a hyphen for indicating what em-dash does. IDK whan en-dash is really used for, but apart from word pairs (like in love--hate) I'd rather not see them. My conception of dashes for daily use: hyphen for compound words or minus sign (too much trouble to distinguish), en-dash for word pairs, em-dash for marking asides in sentences (where they denote kind-of a different tone from paranthesised passages).