I wonder if the "bumblebees should not be able to fly" conclusion was arrived at in the days of the slide rule, or if we needed the precision of the computer to arrive at that conclusion!
It was the precision of early computers that was the problem. As the saying goes, "A computer is always certain of its response. It's not always correct, but it's always certain."
It took more sophisticated computers able to integrate a lot more modeling data to conclude that a bumblebee really can fly.