The problem is that most people don't need to measure things in day to day life, they only need to estimate. Those that do need to measure already know that th

The problem is that most people don't need to measure things in day to day life, they only need to estimate. Those that do need to measure already know that they have to track units no matter which system of measurement they use (as the difference between entering grams by accident instead of kilograms is 3 orders of magnitude!)