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.
What does that mean? Isn't "use of multiples of fractions" a property of numbers in general?
> For some people, a simple fraction of a relatable unit really is easier to deal with than a base ten decimal
What's easier is what you're used to. That's the whole point.