There are different types of bodies throughout the world. some are smaller, some are stretched. The proportions you use should fit to what you are trying to draw. A tall person has propably different props then a short person etc.
In the end, it's more about having a system and some kind of measurement for drawing bodies instead of just drawing how you feel.
one interesting thing is this: where did you get this measurement? I like it since I myself have tries to figure out how to do proportions in a quick way.
One thought that comes to mind is this:the heads system
7 heads is normal or avarage, 9 heads is tall. by that system, lets say we pick the 9 heads one.hands are always about under the dong/vagina about 1 hand, so by this, we can figure out how many hands 4-5 or more that said 9 headed persons should have.
since we artist deal in imaginary fictional creatures that are really high OR short, one can use this system.