Why is monitoring of neuromuscular function necessary in the practice of anesthesia?

Why is monitoring of neuromuscular function necessary in the practice of anesthesia?

Muscle relaxants, by interfering with neuromuscular transmission, cause paralysis or clinical weakness. Because these drugs are frequently used as adjuncts to anesthetics, some means of monitoring depth of neuromuscular blockade and recovery are necessary to ensure adequate intubation conditions, sufficient surgical relaxation, and enough recovery of muscle strength to allow relaxant antagonism before tracheal extubation.