Nanner = short for banana is intersexing and while I agree that in certain situations it can be caused by stress factors, it is also something that can be bred in to the plants. It is partly genetics because good genetics will not throw bananas.
In other words if a pin hole of light is causing an issue that is genetic. If it were to show on more than one plant during a grow, that is genetic.
If a plant inter sexes and pollinates plants to the point is it making seeds "to me" they are trash and belong in a trashcan. Truth be told if everyone had that mind set there would be far less crap on the market.
That said it's good for business for me. Drops competition way down.