But our system is called the English, as oppose to Metric, weight system!!! Why don't WE have "Stone"?????
Those of us in the Anglosphere stick stubbornly to the English system of measurement!! I don't know why you include stone, but Americans always had the habit of doing things differently, also the Imperial (English) System has a lot of units that aren't normally used, such as 'hands' or 'furlong'.