Non-tech people don't know that a phone might not work to unlock a car in and underground garage. Tech people would assume Tesla built this thing to work witho

Non-tech people don't know that a phone might not work to unlock a car in and underground garage. Tech people would assume Tesla built this thing to work without network availability. Maybe via Bluetooth with some key exchanges? This assumption by coder and companies that services are always available is a nightmare. How many sites completely stopped working last time Facebook login went down? I am not saying build for every possible situation but don't assume the service you are relying on is always available.