I think it occurs only to balance the body.The example can be the person moving on rope by extending his arms.If one of the arm become paralyze he can not balance himself and fell down.
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Neurons decussate, or cross over, at different points in the nervous system to allow for communication between the two hemispheres of the brain. This crossing helps with functions like coordination, sensory processing, and motor control in the body.
Synapse
what is the role of sensory and motor neurones in a reflex arc
Motor neurons decussate in the lower part of the medulla oblongata located in the brainstem. This is where the corticospinal tract crosses over, allowing motor signals from one side of the brain to control muscles on the opposite side of the body.
The optic nerves and the pyramidal tracts are two examples of nerves that decussate, or cross over to the opposite side of the body, within the brain. This crossing of nerve fibers helps with the coordination of sensory and motor functions between the brain and the rest of the body.
Neurones