Earlier quoted context omitted.
Except you could enable trade without banning curvy bananas. All they had to do was standardize a rating system for bananas, and then countries could chose to ban whichever ratings they liked. Its a clear system that allows and enables trade, while letting countries have their own regulation.
It's not that simple. You're falling prey to a common misrepresentation of EU regulations. They were all initially very complex, sometimes looking almost absurd, because they were comprised and based on the bilaterial treaties and regulations of 28 member states. The EU then gradually simplified the regulation over the years. You'd think that simple combinatorics would make people understand the benefits of this proc…
If the purpose was to facilitate trade, the way to do it is by providing information to those who want to trade, not by banning them from doing so.