In 'Traveler' they went somewhat of a middleground, with a Forsaken who is very fragile and keeps falling to pieces, but doesn't actually die from it, but can simply stick his limbs back on ^^ I guess if he actually lost a limb completely (I mean in the sense of not being able to find it again) he'd have to get a new one and sow that one on. Which is also what they do in Before the Storm.