Slots 4 and 3 are usually filled with enchants related to skills. There will be a change (buff or nerf) of some skills, it would be great if we can reset these slot without reset the 2nd slot.
From the last patch, we can only reset the whole enchant (including 2nd slot), while perfect enchant on 2nd slot cost huge materials, thus imo resetting fully enchanted dim weapon are huge loss.
quick mafs:
80% cost of +12 Grade A fully Enchanted lv 5 dim glacier weapon are from enchantment materials
20% cost for grading (it has upgrader box that not consume BSB)