| The door fits into the shape of the opening and could be adding some rigidity along those surfaces as well. All the latch has to do is keep it in position. Also, if you want to make a claim that is contrary to conventional wisdom, you are the one that must supply the proof. If I showed up and said 2+2 actually equals 5, no one would be convinced even if I produced a math book that did not explicitly say that 2+2 = 4.
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