Manufacturers design a crank with a particular chainline and a particular spindle for a particular BB width. Whatever the dimensions (including the spindle taper) that were used in that design is what you should use every time. The manufacturer has no allegiance to any previous rule for spindle dimensions.
Standard 1970s cranks had the hole for the spindle starting as far right as the outside edge of the inner chainring. As manufacturers attempted to make the cranks lower profile and decrease the weight of the steel spindle, they moved that spindle hole toward the left and shortened the spindle accordingly. Each crank design is different.