It's not about its flight model, it's about ship design and whoever is doing the design obsession with adding pointless wings.
There was a lot of spiel about function of the ships - what function do the wings provide?
Why did they do all that unnecessary crazy stuff to cars in the 50's.

It might just be a tradition keeping aesthetic or perhaps they add a little stability in atmosphere, who knows. Not sure why it matters really. Chances are they just added them to break away from the 80's faceted arrow head shapes.