I grew up in the UK where the government was too cowards to properly go metric so we did it the laziest possible way: teach the children (me) centimetres and millimetres and litres and grams and kilos, and then let them be confused when they leave school and enter The Real World with its bullshit nonsense, meaning the people who are old enough to vote won't be all upset about itAmazingly it actually worked, everybody works in mm now, because the children grew up and The Real World became Our World and the inch people died of OldThe US isn't even doing that, we showed them the easiest most half-assed most cowardly way of solving a big problem over decades by Not Solving It But Dying Instead, and they're not even doing that, my kid's homework talked about measuring in inches or paperclips or pencils you can measure in anything really