The best FU waiting to happen had to be the 61 with tank qty, written by the filler, in US Gals, the gauges in lbs, the refueller delivering in lts.
You've just explained my question.
I was told the oil companies prefered it that way. That's why I spent half my time at preflight doumentation and deck running checking that the dispatcher had calculated correctly the passenger and freight he had weighed in Kilos into pounds.