Could someone please explain why the odd external camera for passenger entertainment hasn't evolved into a standard flight deck facility for monitoring airframe/engines/baggage hold?
Said cameras are not for passenger entertainment, they are to assist the flight crew with various tasks such as taxiying and are necessary because of the size of some aircraft v the dimensions of airports/taxiways/aprons etc etc.
With some airlines the images from the cameras are routed to PAX screens for entertainment This is a pax EXTRA !
Basically, as has been said, its been considered and its coming.