It is usually clear that 2-3 thingies means a range of thingies, but I seem to remember there being situations where it could also have been a minus sign. Perhaps it was with placeholders, where 10-N could be either one. Problem is, iirc, the real minus sign is longer than the hyphen, looking like an en dash (the one meant for ranges) and so it defeats the purpose... hence I totally use hyphens as minus signs, but en dashes for ranges, which makes sense in my head because a range has a certain span/length whereas a minus sign is just a little mark to indicate that something is negative. I see lots of people/software use en dashes for ranges but the existence of a real minus sign is, from my perspective, mostly just noted in typographic resources, so I think this reflects most people's usages (for the people that care for these details)

I do like that the em dash is as long as it feels that broken-off thoughts should be

Not everything has to be functional, sometimes things can also just look nice for the sake of it