OTOH, people generally have 10 fingers and 10 toes - hence the decimal system. Also, the metric system - as originally designed - is based on the size of planet Earth.
One meter was originally defined as one ten-millionth of the distance from the Equator to the North Pole. A centimeter is 1/100 of a meter. A cube 10 cm on each side is a liter, and a liter of water weighs a kilo.
I learned metric first, and to this day the Imperial system confuses the hell out of me. Like, why are there fluid ounces and volume ounces? How many ounces in a gallon? Who the fuck decided that there should be 5280 feet in a mile? Etc.
Imperial units have useful factoring properties. A yard can be divided into 2, 3, 4, 6, 9, 12, 18, or 36 equal parts measured in integer inches. Try that with a meter. A gallon is 128 or 2^7 fluid ounces--4 quarts or 8 pints. A pound is 2^4 ounces. Four ounces is a Quarter-Pounder (except in France where it's a "Royale with Cheese"). One fluid ounce of water weighs one ounce (called an avoirdupois ounce).
English coinage had similar properties before they went decimal. Twelve pence to a shilling, 20 shillings to a pound. So a shilling could be split 2, 3, 4, 6, or 12 ways. Unfortunately, harder to accommodate when writing code.