The ABS example makes perfect sense. Is the driver really going to know exactly what speed or pavement conditions need to exist before ABS activates? No. Is the driver really going to know exactly how long ABS will activate? No. All the driver knows is that the car has ABS. In this case, Apple responded to complaints about auto shutdowns (that were themselves a built-in safety feature to prevent damage) and added a functionality that would slow the processor down to the level necessary to prevent an auto shutdown. That's it.
Another example with cars would be mileage per tank of gas. It's not always going to be the same due to changes in speed (which effects mileage per gallon), but how many drivers have specific knowledge of the ratio between speed and mileage for their specific vehicle? Very few.
So let me get this straight.... since you brought up a good example.... you would be okay with the car taking over and slowing down suddenly when you are driving ? To maintain mileage per tank.... no... no...very dangerous
ABS example makes no sense . unless you want to say that the ABS will not kick in at times to preserve the tyres ....