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> the car should just shut down when it detects the key is not inside the car.

Well, you can't have the car shutting off if the key is suddenly not detected. The battery might be low, or the key gets dropped behind some metal. But it does mean that after you've turned it off you are stuck there.

This is quite dangerous going down the highway at 55mph when a GPS jammer malfunction causes the fob to 'disappear'.

The keyless car I owned would warn and beep like crazy about the key missing, but it would continue driving. Then when coming to a halt and shifting into neutral/park it would deny switching back to drive. So no danger while driving and no risk for stealing.

My Honda CR-V will periodically beep with "NO KEY" lighting on up on the dashboard(say I give my wife the key to get inside our home on a crappy day while I go park the car elsewhere), but doesn't make impose any restrictions on using the car while it's on, regardless of your current speed or gear. Once you shut the car off though, that's it.