I have a two-door which doesn't have this feature, and when someone slams the door or the trunk while I'm in the car, I can feel the air pressure on my ear drums. I think that's one reason for the feature. Another is that it takes a bit more to close the trunk (mine's connected to the cabin, like a hatchback), because of the air getting compressed. I have to push it all the way down until it latches.
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