1 centiyard is about equal to 1 centimeter

1 miliyard is 3 milifeet

1 kiloyard is 3 kilofeet

It would be the same as the metic system having something like a “hand”

That if you wanted to express 1/3 of a meter you could just call it 1 hand. 2/3 meter would be 2 hands.

If you were using this metric system and knew that something had to be two hands long. You’d simply call it 2 hands instead of .66 meters or 66 centimeters.

If something had to be 2.5 hands long it would be .825 meters or 82.5 centimeters

Meter and yard are both random established lengths. Using miliyards or millimeters is exactly the same.

US customary units just have smaller unit names you can call them if it is convenient. If you never wanted to use anything but yards like the metric system does meters, it’s possible. Don’t want to use miles? Then megayards.

I do think 1 simple system that everyone uses is needed and the metric system is simple.

But if stupid Americans can use the “difficult” system, it can’t be too hard.