I feel like this is actually quite a profound metaphor.
I feel that were I literally handcuffed to a vehicle in which I had charge, I would be a MUCH more attentive and dedicated driver. Distractions would be minimized and my world would become focused on this one single task. It would not actually stop me from doing the task, which is driving the vehicle… Instead I would be more inclined to maybe learn exactly how the car would respond to my wishes and therefore, when the handcuffs were eventually removed, have a deeper understanding of the tool itself, in this case the car, and would then be able to branch out from there into greater heights based on the solid foundation of my understanding.