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Perhaps so but I don't see any asymetrical aircraft in service today. That leads me to believe asymetrical designs are a bad idea.
Everything I have read suggests the Fw-189 was one of the finest short range reconnaissance aircraft produced during WWII. Perhaps the BV-141 would have fared better if the competition had not been so good.
+ the 189 had two engines and may limp back home with one of them disabled