The issue is that carbon fibre is strong, hard, but brittle. When it fails, it fails catastrophically. It also doesn’t show many/any signs of failure, till it fails.
A carbon fibre hull, under those loads, could be good for 5 dives or 100, depending on the vagaries of how it was made. It won’t show the wear, until it fails. That is why most companies won’t trust CF under those sort of loads.
I suspect it’s related to the difficulty in processing. Kiwi fruit are quite small and non-trivial to extract the flesh from. This would make it more expensive to extract.
This is less of an issue now that a few decades back. However, most people are quite conservative on their juice choices. Low sales still mean higher cost, which reduces sales.