because a backup camera has very specific requirements like being able to function in basically all weather conditions and having zero delay.
the quality of a backup camera is basically irrelevant, once its good enough it will be doing everything it needs to do, increasing the quality wont make you park any better or see things any better.
beside this car manufacturers are trying to save money where ever they can because you may think its only a few bucks more but if you build 10 million cars like for example Toyota does per year you suddenly spend tens of millions on that one single part.
To see how cheap car manufacturers are just look at Tesla and their missing sensors like rain sensor, USS or even radar.
Tesla is trying since 2016 to replace a rain sensor that costs literal cents with a software solution that uses their camera, it never worked and is still not working 8 years later and still they wont spend the few cents on that rain sensor.
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