Really? I struggle to see how dividing any number by two is easier than dividing it by ten, but would like to be enlightened. Divide by ten I just need to mentally move the decimal point, dividing numbers such as 35 or 123 by two requires a lot more mental arithmetic.
It's a snap to fold a piece of paper in half, thirds[0], quarters, sixths, eighths, (etc), but I'm not aware of a trick that lets you divide a sheet into tenths.
[0] Higher powers of three seem tricky too.
For example, how is "12 inches to a foot, 3 foot to a yard, and 1760 yards to a mile" base 2?
My understanding, before reading your post was that US customary was basically adapted from imperial which was in turn just an adaptation of folk measurements - a foot was about the length of a foot, etc.
How is dividing by 2 easier than moving the decimal point by 1 place?
Fold a piece of paper into 10 equal parts perfectly. Easy?
Jefferson was responsible for US customary and got a lot of it working; the French were responsible for metric, but were interrupted by The Reign Of Terror.