I imagine that someone within Tesla really, really wanted the driver's side door to open upon unlock--probably because the auto-presenting feature has proven too unreliable. However, if the door opens on unlock, and the unlock was accidental, or temporary, how do you then close the door remotely? You don't want to have to walk over and push the door closed. I don't believe the X fob has any hidden buttons that can control the front doors. Furthermore, an open driver's side door breaks lock; you can't lock the car if the door is open. So, why not make the driver's side door close on lock via a single click? Now that the front door closes on a single click, why don't make all doors close on single click?
This line of reasoning make some sense, but since closing all doors on a single click is, in practice, untenable, the solution, in my opinion, is to either remove the feature whereby the driver's side door opens on unlock, or else only close the driver's side door on single click, and/or add a triple click to close all doors.