The floor is all yours to defend the American measurement system.
That is your opinion. Metric system is inferior.
Man in America.... hey Joe, I've got a 5/8ths inch wrench but it's too small, can you toss me the bigger one? Joe fishes around but really has no clue what the next size up is (it's 11/16")
Man in China,...... hey Ling, I've got a 16mm wrench but it's too small, can you toss me the bigger one? Ling quickly tosses his fellow production worker the 17mm wrench.
Multiply that lag time and one country will be much much more efficient than the other country.
So, explain to me why the metric system is inferior. Thanks.