I would argue that's a result of the way Homekit and Siri interact, and not the fault of the August Lock. August put the Homekit chip in the device.
Apple should really require a code along with the unlock command. It's also why Amazon asked some skill makers to remove unlock functionality recently.
It's harder to conceal a spoken command than a keypad-entered code. Spoken words are unavoidably broadcast to nearby surroundings, but you can mask your use of a keypad easily.
Apple should really require a code along with the unlock command. It's also why Amazon asked some skill makers to remove unlock functionality recently.