I finally had the logic of backing in to perpendicular parking spaces explained to me in a way that makes sense.

• The driver’s visibility ahead of the vehicle is better than behind it
• There are more potential hazards in the traffic lane than in the parking space

So nose-in-back-out puts the better visibility in the zone of lesser hazard, where back-in-nose-out applies the better visibility to the zone with the greater hazard.

@Cdespinosa in Chile this is explicitly explained in most parking places where this is a requirement. Also, because of seismic activity, it is easier to evacuate when all cars have the nose out.
@juandesant @Cdespinosa Aside from those considerations, the front end has more lateral mobility, making it easier to get the car into the proper position when reversing into a tight space. Simple geometry.