Re: "250 grams (1 pound)"
Been saying this for soooo long now....
We are engineers, a major ethos of engineering is 'Appropriate units/tolerances' and just as you would not measure the distance from Cardiff to Glasgow in millimetres/inches/angstroms, nor would you insist on a unit for fashion reasons.
What are you measuring, what is you tolerance - that will indicate the most appropriate unit.
Don't forget, a very large part of UK measurements are still done in Imperial because there is no real benefit to change it. Anyone want to guess how much it would cost to change all the road signs and car speedometer/odometers?