Originally Posted by Longfemur

If it's about proportionally short or long legs, rather than the whole person's height...

Any such situation creates some significant bike fitting problems. For example, if I'm 5'2" but I have the legs of someone taller, then it has to follow that my torso is that of someone even shorter than 5'2". The converse is also true, which might apply to taller people. You can imagine the problems that creates with frame size vs frame length.