Ok cool, but this is madness as an add-on for Cosmetic lengthening. Like how many people on a regular basis would even notice the difference. Also, unless you have dwarfism, what would be the benefit of a longer arm span?
If you did limb lenghening, and your arm's length doesn't look proportional to your legs, shouldn't arm lenghening be considered!?
does it matter?
If you are doing specific jobs like modeling, it probably does. You've to be on the stage walking and wearing new dresses.
Most of us will not become models fortunately but yeah you've got a point.
Or, if you want to be a movie actor or someone representing commercial, some directors do care about it.