When I used to work on those devices, the arguments went something like this: "Adding video input means we need an additional connector on the device, which th

When I used to work on those devices, the arguments went something like this: "Adding video input means we need an additional connector on the device, which the Industrial Design guys hate." "We could multiplex the signal, but then we need some kind of proprietary connector and the additional cost of that circuitry." "How many customers want to record video from an external source anyway? It's not worth adding $5 to the MSRP for a feature that isn't going to get used."