No you are wrong. It will cause divers to disregard their pressure guage, breath their main tank down to nothing, fail to stay with their buddy and cause them to never learn how to calculate their air consumption, to plan a safe dive and will give them a psychological crutch which will tempt them to exceed all recreational dive recommendations..and besides that you can easily do a CESA from all recreational depths ...and, and, and, .... don't forget that whatever pony someone might choose, it is definitely too small. Does that sum it up?