Why We Stretch

"The proprioceptors detect any changes in physical displacement"(1).
To detect the location of limbs the body senses changes in the location of limbs. If you stimulated the muscles with an electrical signal and the person could not see, would you have a proprioception confusion?
"[stretching] helps to realign any disorganized fibers"(1)
This can help in recovery from an injury or just daily work. Daily stretching can help to keep the muscles in line and straightened out. I wonder if this would help prevent or treat knots or tightness in the muscles.
 In "What Happens When You Stretch" the benefits and physiology of stretching is discussed. A stretch needs to be kept for a longer period of time to get the complete stretch. Stretching helps to align the muscles and extend the muscle fibers. The lengthening reaction takes time to happen. Stretching first extend the muscle fibers then the connective tissue. The middle part of the muscle stretches first then the edges begin to stretch when the stretch is held.