A number of HA wearers are elderly, frail people. An accelerometer can tell if your head experienced a serious deceleration (your head hitting the floor and knocking you unconscious with possible internal bleeding, etc.) and through a smartphone app have your phone call 911 and your emergency contacts or your assisted living facility caretakers, etc. So the addition of an accelerometer with monitoring features might be a decided plus for some people. Since I have a cardiac condition, I value the same functionality in my Apple Watch. With the watch, it asks me to confirm my status before it calls anyone. If I don’t answer within 30 sec, it will automatically place calls as I have directed (911 and emergency contacts). My iPhone (and watch?) will report my whereabouts to my emergency contacts, e.g., I’m put in an ambulance and taken to an EMS facility.