I think it’s because of the synergy using your ability helped charge your ability and whilst the hunter had something similar not only did it lack true synergy it only affected the hunter (due to them naturally being a selfish class). I think they realized that it could become too powerful especially since it could be applied to multiple people at once. Think about the scale of difference. All in all resupply still works very well and is still very useful it just doesn’t make you AND your team nigh unstoppable.