10 can be divided in third and quarter fine. It does 10/3 and 10/4=2.5. Well, 10/3 isn't round so people don't like it but neither is 1/3 of an inch. It's not because a lot of operations suddenly become doable with numbers that you magically lose the usage of fractions.

True, yet most of the rest of the world seem to be suffering any from this 'deficiency'.