We now have people complaining that resources removed from raids are hard to come by. At the time of removing (and even still for some) we had too much. If they allowed say mk4 guns to be made into mk5 even at reasonable rate exchange it wouldnt be long to dry up stockpiles. then get complaints it's a bottleneck the next time a character or squad requires more than we expect. Or we have a abundance of mk8 implant and use them for exchange not knowing it's going to be a problem later.