On 2010-10-31, J Burns wrote:

The millimeter is about the smallest increment that can conveniently be
read on a carpenter's tape. A hundredth of an inch would be too fine
and a tenth too coarse. Metric measurements make it easy to calculate
volumes and, for materials about as dense as water, weights.

Metric is superior in every measurement except temperature. Using
whole numbers, one degree of Celsius is approx 4 degrees of
Fahrenheit, giving F more granularity in whole numbers.

nb