The rank it gives is purely one dimensional yet comparing passport power is multidimensional. For example I compared Canada, Australia and UK. Canada got 166 ju

The rank it gives is purely one dimensional yet comparing passport power is multidimensional. For example I compared Canada, Australia and UK. Canada got 166 just above the others but looking at the compare list some countries give visa free for fewer days than the others. Is that more or less "power"?