It just falls apart when you try to define mass nouns in terms of number. Different languages handle mass and count nouns different, just as Japanese where noun

It just falls apart when you try to define mass nouns in terms of number. Different languages handle mass and count nouns different, just as Japanese where nouns have no inflection for number and you use conventionalized counter words to indicate quantity. "This is eight milk". Cups of milk? Glasses of milk? Cartons of milk? Liters of milk?