I'm not going to disagree that trade is broken, but not because of how you think.

Main reason why trade is broken is lack of need/drive for resources. Currency is still not used due to very little need for them. Resources are useful for massive grind, and they are the most valued of items next to blueprints which unlock building. Building is 90% of the Xsyon.

Economy needs a LOT of thought put into making it more robust, starting with a reason to use currency/sink for it. The current sink is 100$ per 10 days per paid person for a minor buff. It takes less than 5mins of scav to get 100$ in game.