I just wish people would step up to a bigger scale when it's needed or to a smaller scale for the same reason. I hate seeing big massive boats measured in thousands upon thousands of centimeters instead of just using meters or feet, and it's annoying when people say their height in hundreds of millimeters.

Or when knife-blade thickness gets measured in hundredths of decimal inches or weird fractional measurements instead of just using millimeters since it's a smaller unit.