I simply don't understand the level of arguing about the need for this feature. Do all of you who are arguing against it carry your phone with you 100% of the time? Or do you only go out to your car when you are ready to drive away in it? WTF?
This is far from an unreasonable request. I can't tell you how many times I have walked out to the car to get my laptop, to get something out of the center console, to get my lunch bag, whatever, and the car is locked. My keycard is in my wallet, but I don't carry my wallet around when I am just lounging around the house, do most of you? Likewise, my phone is likely sitting in the family room, the kitchen, the kitchen table, whatever. It's not glued to my hand, and that's hard to believe as much as I use it.
Also, when my kids / wife go to get in the car, sometimes they are ahead of me (lol, not often) in going out to the garage and getting in the car. I may still be grabbing a water / coffee to go, grabbing my phone (ironic), or whatever where the phone is out of range of the car. I come out to them, not comfortably seated in the car getting ready to go, but standing in the garage next to a locked car.
Walk away lock is very useful, I love it at work and wherever the car is out, hence the reason I use it. I suppose I could turn it off and lock the car manually every time, but it's a PITA to grab the phone, open the app, wait for it to connect, and hit lock vs. the keyless entry or even just pressing a key fob which can easily be activated in my pocket without pulling it out and looking. So yes, this IS a design flaw, related to Tesla's not offering keyless entry or a key fob. It should have the same pop up that Sentry mode does, and the ability to enable / disable at certain locations.