You may just as well require a click on the key fob or phone, the cost savings would be exactly the same.
This is precisely what I mean by "brain dead". You'll forgive the hostility, but this is exactly what I'm talking about!
Nothing about this list of things REQUIRES proximity unlock. You can still require the user to push a button on their key fob to explicitly unlock the door.
I get the convenience factor, I do. If that's a feature you enjoy, then great! All the happiness for you. But give me the chance to opt out of something that is deeply broken from a security perspective.
Let me press a fscking button to unlock my car, instead of my car deciding I probably want it to unlock.
Customers "pushing for convenience" are unaware of the possible security implications of it (to put it in a polite way). And it is absolutely the duty of manufacturers to shut them away from stupid crap like that.
Ask any consumer if they want a Pony and they will say yes.
And in Tesla's case, it saves money. There is no cylinder on the steering column, no cylinder in the door, no steel key to manufacture, no rod going to a physical unlock switch, and no physical unlock switch. So we've saved 500 grams in the car and probably a good $20 too, no to mention the room in the door for the rod and the physical switch, which add engineering work.
There is a long tail of removing grams and dollars from the car manufacturing process, and 500 grams and $20 is significant. This long tail is why e.g. the Model 3 uses a touch screen for most controls, why the rear glass extends far into the roof, and many other seemingly-"premium" features of the Model 3. It's actually cheaper to manufacture them this way.