> I've never understood car makers obsession with proximity unlock.
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.