I am reluctantly fluent in metric, but the foot is very useful. I even had a foreign born friend say so unsolicited two days ago (when I was discussing how the Fahrenheit scale is the one holdover I want if the US goes metric).
On my logistics gaming system I use cubic feet and kilograms as my base units. A cubic foot is an easy concept to put your arms around both literally and figuratively. Cubic centimeters and cubic meters are harder to conceptualize when you are discussing the volume of an item. You can do liters for volume, but there is a bit of a disconnect as most people dont realize it is a decimeter cubed.
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