If you know that it sounds cruel, but you want to discuss it start your own new thread then. If I could I would delete your reply.
There are many different gases, oxygen, helium, argon, propane etcetera.
A government, for example, has many powers.
There are almost as many currencies in the world as there are countries.
Or can you say a furniture?
Yes, that one I agree with! But, I mean, there ARE nouns that can NEVER be countable or nouns that can never be uncountable, aren't there? Someone had to do some subsuming to organize things. Saying that countable/uncountable nouns are a figment of our imagination is but a stretch, isn't it?