The sizes of metric measurements just don't fit the world, people or the things in it very well. When designing environments for humans, using measurements derived from basic human characteristics is appropriate. That is why the metric system will never be adopted in the US.
However, for dimensions having nothing to do with human beings, astronomical measurements, microscopic measurements, atomic physical properties, etc, there is some justification for using the metric system. In any event there is no decent excuse for any one not having a decent understanding of the metric system.
That doesn't mean that measuring my height in centimeters or weight in kilograms or the size of a room in meters isn't utterly ridiculous. Dimensions for tools and environments for use by man should be based on measurements and proportions of man. Base 10 is inappropriate, as physical properties are based on multiples of small prime numbers. Hence the common 12 units, 6 units, three units and other non decimal ratios in the English measurement system. You thought they were arbitrary? Think again. They are natural.
I know! Let's decree that the ratio between the diameter and circumference of a circle must be 10 for ease of calculation! Since when is ease of calculation justification for the destruction of natural truth?
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