these are not the living dead, the point is that the consciousness can be freely transferred as well as ourselves, when I am on a mission in another world where the physical conditions are different, I must have a modified body, what you are talking about is simply a consciousness implanted in any body, even now you can attach another consciousness to you and it will guide your body even if you are aware of it, why revive a dead body when there are a lot of clones and freely modified, you transfer the consciousness itself and all this and to the fight