Destroying the metal casing means the whole disk takes about 10 seconds to destroy, and doesn't require a "stomp on a screwdriver" step that OSHA may not approv

Destroying the metal casing means the whole disk takes about 10 seconds to destroy, and doesn't require a "stomp on a screwdriver" step that OSHA may not approve of. Your procedure absolutely makes sense if you have a single-digit number of drives to destroy once in a while at home, not if you have to destroy dozens regularly.