In some cases, traditional units remain in use because they are more convenient than metric. This is a world-wide phenomenon, not just US/UK. In Japan, people s

In some cases, traditional units remain in use because they are more convenient than metric. This is a world-wide phenomenon, not just US/UK. In Japan, people still size farm fields in -tsubo and rooms in -jō. Secondly, the world-wide conversion to metric is less thorough than claimed. In less developed countries, daily practice less often conforms to official documentation.