It's just so much easier to do math and not nearly as confusing when you're trying to communicate with someone. Pound? Wait Pound Force or Pound Mass, wait maybe I meant a Slug. Horsepower, wait what. It's like someone randomly pulled names out of a hat and assigned them random numbers.
I've never needed to know the amount!
But then again - who's used the pythagorus theory since leaving school? :-)
Wonder if this would ever drive a similar change in the States.
I still can't think of fuel economy in anything other than mpg despite not knowing how many gallons are even in my tank.
I still prefer miles and gallons to km and liters but if I am doing a precise measurement I will use mm. In electronics everything is metric so that is what I use.
Conversion errors kill spacecraft...right?