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I agree with you about the camera not being a primary backup tool. But I don't think using a $30 camera instead of a $7 camera in a $60,000 vehicle would break Toyota's bank.
Unfortunately, Toyota products which have been the focus of all TMC lately, has yet to receive an HD level camera. I hold little hope any of the old platforms are going to get upgrades in Lexus.
While 30 vs 7 is laymen speak, those cameras probably require a lot more initial qc money before being placed into service.