Over 70 billion chickens are slaughtered annually. At this scale, even small improvements in slaughter welfare would prevent enormous amounts of suffering.
Live shackling involves hanging birds upside-down by painful leg shackles while conscious. Waterbath stunning can fail if birds raise their heads. Neck-cutting while conscious causes pain before loss of consciousness. CAS systems with multi-phase inert gas (nitrogen or argon) achieve loss of consciousness without prior distressing handling — and the technology exists at scale.