Split (reason: Should be split by game like other perks)
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“Protect yourself from the dangers of the Wasteland. If you're the sort to tinkerer at an armor workbench and want to craft some impressively protective gear for yourself or your companions, choose this perk.”— Fallout 4 Vault Dweller's Survival Guide description
In Fallout 4, the perk is needed to craft mods from scratch, not for applying or removing mods. It is possible to remove an uncraftable mod and apply it freely on a different piece of the same kind of armor.