It's hard when you get a loaner car from the dealer and that car doesn't lock when you walk away.
It's a habit you quickly forget. You're just walking away waiting for the beep. No beep, you have to press the fob.
I do also hate when dealers advertise the backup camera as a security feature. It's mandatory, you don't advertise seatbelts or airbags (unless there are 37 like in a modern Mercedes).