This is exactly the point. If storing random data was the norm (formatting utilities would offer it) then it would be hard to make a case against it.

And it actually _does_ make sense for formatting utilities to offer it, as this is a good way to ensure that data is really gone after formatting (writing all 0s or all 1s could leave information at the physical layer; and any intermediate layer could not compress random data much so the data must be overwritten).