I was recently given a document showing the UTM zones as they appear over the whole Earth. Each zone is 6 degrees longitude by 8 degrees latitude. A numbering system proceeds from 1 to 60 from -180 degrees longitude eastwards, and a lettering system proceeds northward from "C" at -80 degrees latitude. All of this is familiar to me.
In ArcGIS, UTM zones are given with the same numbering system based on longitude, but appear to have done away with the latitudinal lettering system, instead using just "N" or "S", meaning North or South of the Equator. Was this simply done to reduce the number of options users would have to trawl through, or is there a more theory-driven line of reasoning here? Are we losing accuracy by doing away with those zone subdivisions?