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I, too, have always thought that wing mirrors would make a great accessory.
When cruising, I like to delegate the wheel to the capable hands of the autopilot. I can then concentrate upon more important tasks such as reading, listening to music, drinking coffee and eating cakes. I like nothing more than lying on a couple of cockpit cushions looking aft. Wing mirrors would save the tedious task of having to move, twist my body and look forward for traffic every 15 minutes or so.
That's what the secondary camera on your phone is for. Better still if you can get a crew member to hold it for you whilst dropping grapes into your mouth.