What practical advantage did the Edinburgh version of the Town class have over Southampton and Gloucester?
Short answerBetter subdivision and more room for additions mattered far more than the small increase in stated cruising range.
NotesThe small range difference between Edinburgh and the earlier Southampton and Gloucester groups is judged operationally unimportant. Greater internal subdivision is the first meaningful advantage identified for Edinburgh. The larger design also leaves more room for expansion and later additions. Those features matter more in this comparison than the approximately 115 extra nautical miles of stated range.