Re: "250 grams (1 pound)"
Unusually, I agree with Dan Paul. Base 10 is an awful way to run a measurement system. Base 12 can be divided by many more whole numbers (2, 3, 4, 6) to get sensible fractions, unlike base 10 (2, 5). Also, inches and feet are easily relatable units in sensible fractions - the gap between centimetre and metre is too big. Using them in language is not elegant either - much easier to ask for a foot of x than 30 centimetres.