Because a know all government knows best? And has never overreached? That said, it doesn't mean a manufacturer can't use sound to their benefit, regardless of

Because a know all government knows best? And has never overreached? That said, it doesn't mean a manufacturer can't use sound to their benefit, regardless of what regulations says. In fact, I believe in Norman's "The Design of Everyday Things" he sites an example (or two) where sound was part of the design of a product.