No it's not. If you were surrounded by lakes. Sure.
It's extremely useful. It's just not in demand. Which is exactly what I just wrote. Land is not at a premium. Space in the cities is, like every nation around the world.
That's just arguing on semantics and deliberately ignoring the context. No one is arguing that there is literally no land to put a single building on anywhere in the country.
Obviously when people say land is scarce, they mean that the useful land that people actually want to live on is scarce.
Having a billion square km of sand in the desert isn't useful when someone wants to buy a place to live and exist in a society.
Yes. And they're wrong. Land is not scarce. No one is mentioning the "sand". There's more space empty with perfect soil than there is space taken up by residential. The outback has nothing to do with it.
Obviously when people say land is scarce, they mean that the useful land that people actually want to live on is scarce.
Having a billion square km of sand in the desert isn't useful when someone wants to buy a place to live and exist in a society.