What they should do to help eliminate the old issue (where players only used certain guns bc they were elemental) is have xur sell an elemental object of some kind, he can sell one each week (arc, solar, void) for 20, 30, 50 strange coins, and they can be applied permanently to any primary legendary or exotic. It elemenates the old issue and helps keep people looking for all kinds of new guns, but also adds another level of customization and personalization.