Yes, garage door cables are essential components of the door's counterbalance system. They work in conjunction with the door's springs to help lift and lower the door safely and smoothly. The cables bear a significant portion of the door's weight, allowing for controlled movement and preventing the door from crashing down. Without properly functioning cables, the door's operation would be compromised, posing safety risks and potentially causing damage to the door and its components. Therefore, garage door cables are indeed necessary for the safe and effective operation of the door.