I think that America and England are both just simply ignorant and spiteful against the concept of Metrification due to it being a European concept.
The faster we get away from rods, poles, chains, perches, hands, feet, yards and change everything to metric, the better. In Australia we also have metric time, in which we have only 10 hours per day. We rest 8 hours and work 2 hours.
Australia was the inventor of Repetitive Strain Injury (RSI), where any work that is repeated more than three times per day entitles the worker to 14 days off work for recuperation.