What's the point of bananas in ice cream sundaes?
It doesn't really provide a textural contrast because the mushy banana simply mirrors the creaminess of the ice cream -- and in many ways gets lost in it.
It doesn't really provide much in terms of taste. Most bananas aren't sweet enough, or pronounced enough in flavor, to really add anything to the ice cream, fudge (or other sauce), whipped cream, toppings etc.
Or is it just there to be provide some nutritional value?
Maybe just for looks?
But seriously, why do people even bother with the banana in the ice cream sundaes?