Avocado is the crop where the pack can cost you the sale by itself. The fruit is sold by count, handled repeatedly on its way to the shopper, and graded on how the skin looks when it arrives. A net that presses a grid into the skin does not just look bad — it fails at the receiving dock, and the mark does not go away.
So the question with avocado is less about ventilation and more about how the load is spread. A net that gives where the fruit is widest distributes the pressure; one that holds a fixed shape concentrates it on a few points of contact.