As far as I'm concerned, the whole "heavy closing door" is one of those "marketing driven engineering" thing. As Elk said, there is no real safety advantage of having a door that sounds and feels heavier to close. It's that a lot of people THINK that the two are related, so the Germans capitalized on that misinformation before the Japanese did.
It's not that I don't like the sturdy feel of the BMW door. It's nice, in the same way that it's nice to have a car that doesn't have interior rattles. It makes the car feel more refined. But just like not having interior rattles, it is of little practical value.
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