Personally, a proper real-time operating system like VxWorks is MUCH more reliable than something like Android, and pretty much most other systems out there. You can just reboot your tablet or phone or personal computing device if it starts to get wonky, but that's neither smart or safe to do while you're traveling down the highway at speed, or playing in the mountains.
That type of opsys is used where safety and reliability is required (stuff like satellites, cars, some military equipment, etc.). The last thing you want is something like Windows running your car.
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