> But they usually directly map to average human experience. > they don't understand anything about non-metric units or their practicality. They don't see it

> But they usually directly map to average human experience. > they don't understand anything about non-metric units or their practicality. They don't see it the same way that you don't see that the units are totally irrelevant, the brain just have to form habits around the relation between the numbers and the world, but as soon as there are consistant and predictable, the extra effort or lack of doesn't change much about their practicality. The habits are formed early, and doesn't require any extra work once set. Having physical relationships between units without having to remembering ratios can be handy time to times, and for your entire life.