The most reliable setup is and will always be a fully mechanical system. The engine management should provide bounds to the operation.
Over RPM Cutout: x rpm
Over Boost Cutout: x boost
Have a think about motoring in general until late 1990s.
Brakes = mechanical with vacuum assistance
Steering = mechanical with crank driven assistance
Throttle = mechanical
Gear selection = mechanical
What happens when you are driving a drive by wire car, with an automatic gearbox and there is a control malfunction?
Electronic Systems like this really need to be properly tested and qualified (costs $$$millions)
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