From what I understand about duality, it is beneficial in that duals help each other see the big picture from either partner's PoV. Dual partners correct each others' false assumptions about the situation at hand. (in contrast to conflictors, who only end up reinforcing each others' fallacies). They also help their partners transform the situation into something more favorable to them by pointing out opportunities their partners may have overlooked.
But, what about when what you really desperately need, due to environmental conditions beyond your control, is the touch of a type other than your dual?