Nintendo has added cameras to multiple DS generations, and included it in the Wii U gamepad. I can only speak for myself, but the cameras went almost completely unused, except in circumstances it was actually fun or useful (for example, seeing the horrifying angles of the person controlling Mario in the Nintendoland escape game).
Nintendo, thank you for not including the camera as part of the Switch. We don't need it, it wouldn't be utilised at all, and all it would do is raise the price of the console. I'm glad you put the money and space into more useful things (HD rumble ftw)
Discussion started at here by maatttxd