I agree arnb but I must remember to clear it when I come home in case my family members do not. And if I am away and my family triggers the alarm accidently, then either the alarm wont sound the next time they want to set the alarm and leave if its the member without a phone or it may if its the member with a smartphone who happens to remember to do so.
This is sort of pointless in a family scenario with people who do not have smartphones or may not be as tech savy and forgetful. It just takes one time of forgetting to dismiss/clear the alert and a thief in your neighborhood for this system to be majorly flawed.