As long as we're in why mode:

In 330 land they tell us the trend is to go paperless. But if there's an ECAM what do we do? Grab a pen and paper and write it down. Monitor fuel? Write down each individual tank quantity. Why not just take a picture with your iPad? Because a Fed went crazy: The iPad becomes a PED the moment you use it in a non approved way. So no flashlight, no calculator ...