I think it makes sense in a world where reading a clock face is common (12 gradations repeating twice is easier to read at a glance than 24 gradations), but in

I think it makes sense in a world where reading a clock face is common (12 gradations repeating twice is easier to read at a glance than 24 gradations), but in a modern world that is international and the primary timekeeper is a phone, I don't think it is defensible.