Comment: Relating the conceivable to the perceivable (Score 2) 835
The point of a system of measurement is to relate dimensions which are not directly perceivable to those which are. Thus, while you can't "see" a mile, you know that it's 5280 feet, the "foot" being related to some portion of the body (or some particular person's body). Likewise the inch, the yard, the fathom, etc. Using metric, while perhaps more "scientifically" determined, replaces one non-human, non-perceivable value with another. Instead of an imperceptible distance being some large multiple of an average person's foot size, it becomes some multiple of wavelengths of light, another imperceptible value.