If only the US would join the rest of the metric world, life would be both easier and make more sense.
Take out 100 kilograms on earth, and your car weighs 220 lbs less.
Take out 100 kilograms on the moon, and your lunar rover weighs ~37 lbs. less.
Take out 100 kilograms in space, and you are still (essentially) as weightless as before, and as weightless as everything else in space.