[WirelessGigabit]

It's not luxury only. Any modern car with an automatic that is controlled by wire will do that.

Start car, leave door open, let go of brake and it'll jump in Park. Safety.

https://en.wikipedia.org/wiki/Anton_Yelchin#Death his death would've been prevented if the feature was implemented earlier.

But, knowing it's a BMW, it probably can be disabled. And it actually still works when you have your seatbelt on (as proof of being in control of the vehicle).