When I used to work on those devices, the arguments went something like this:<p>&quot;Adding video input means we need an additional connector on the device, which the Industrial Design guys hate.&quot;<p>&quot;We could multiplex the signal, but then we need some kind of proprietary connector and the additional cost of that circuitry.&quot;<p>&quot;How many customers want to record video from an external source anyway? It&#x27;s not worth adding $5 to the MSRP for a feature that isn&#x27;t going to get used.&quot;