The literature suggest that the floral remnants act as a place for fungus to hang out. On Cavendish varieties and plantains deflowering can help control cigar-end rot. The flowers also serve as a hideout for thrips, which can be a big problem in the spring leaving little raised black dots all over the fruit.
Originally Posted by Akula
Great to see a video of these techniques in practice. I didn't know about cleaning the little flowers off the individual bananas. Thought they just fell off.