If you've forgotten to lock your car for an hour, being able to lock it from your phone saves you what, 30 seconds versus walking out and using the fob?

Let's say you're not at home, well, (1) neither is your car and/or (2) it's still unlocked for however long it took you to remember.

Most new cars automatically lock the doors when you walk away from them anyway.

I'm just not seeing the benefit here.