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You are right, it isn't always safe to leave the door open, especially when parked-on-the-street (as opposed to a drive)
We have other issues with hands-free-locking, example: when filling-up-with-fuel and a child is in the car (fastened into safety-seat) - walking-away locks the car and risks the alarm going off because sensors detect the child? I'm not keen on leaving-the-car-door-open on the garage forecourt, is there a way round this? Similar issue with a child in the car and returning a shopping-trolley? I never came up with work-arounds, so ended up disabling hands-free-locking. 

Not fully open, just not tight closed. If you unlock the car from the button on the card, when away from it (2 m), it would not lock.