Silver Fruit are extremely finicky to bark properly, it requires a lot of training and is fairly miserable. Other cultures do harvest SF, but it is an exotic trade item like Apples or Strawberries in medieval times. Basically any culture could switch over but it would take over their social structure because it requires such extensive training.
There are other cultures that focus-farm them with different structures, I'm still working on those. I don't want the cultures to be copies of real world cultures if possible.
What would the world consequences be for a bug that eats the bark but does not kill the plant?
By the metric of being wholly dependent on the GM for noncombat interaction Fighter is an NPC class.