I also had to do a business requirement document in capstone here at NJIT and I see the similarities between this and the design validation process. The business requirement document had us list all the costumer needs and make sure we fulfilled them. This is similar in that validation checks that the inputs are the user needs or intended use and then validates whether the needs are met. As mentioned, it is common that devices go through these processes, as it is a good way to make sure the product fulfills the costumer needs so it will be useful to the market.