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Crest Releases are necessary when the rider does not have full control over their upper body and their arms and they will apply pressure inconsistantly to the horse's mouth before the horse has completed the jump and begun to stride off to the next fence.
Very few riders have this upper body strength & control unless they are riding all day every day, and jumping as frequently.
The Crest Release was designed so the rider would not interfere with the horse's mouth before he was fully completed in his jumping process, and onto the next fence. Rider Interference is why horses have jumping vices, and are reluctant to jump medium to higher fences.