I am imagining a circumstance where you need to accelerate out of a dangerous situation and cannot! I have an Infiniti that the sensor on the throttle pedal failed (later recalled by Nissan for this) right in the middle of an intersection! It is a throttle by wire arrangement and no physical link to the throttle bodies. I was luckily able to clear the intersection safely, but the loss of accelerative force in a critical situation could have been catastrophic. Thats why the NHTSA made them recall it.