On materialist reconstitution views of the resurrection, we cease to exist at death, but then we are reconstituted at the resurrection. On Thomas Aquinas's view, we cease to exist at death, though our soul continues to exist, and then at the resurrection we come back to life.
On these views, we should view the badness of death as primarily constituted by a cessation of existence. But Christ did not cease to exist when he died. The Trinity did not become a Binity between Good Friday and Easter Sunday! So if the badness of death is primarily constituted by a cessation of existence, Christ either did not die or at least did not undergo the primary badness of death. And both options do serious damage to the doctrine of atonement.
(The view of death that seems right to me is that death is the destruction of the body. And Christ underwent that.)