The shell is synthetic in comparison to the eternal life it clothes. Every true Christian has been imbued with eternal life. It is planted as a seed in our mortal bodies that is constantly maturing. This glorious life of God in us exerts pressure on the shell, and, at the very moment resurrection life is mature, the shell breaks. The artificial bounds are broken, and, like a newborn baby chick, the soul is freed from its prison.
Death is but a mere breaking of the fragile shell.
At the very precise moment our Lord decides our shell has fulfilled its function, so must God's people abandon their old, corrupt bodies back to the dust from which they came. That kind of talk is absolutely foreign to our modern, spiritual vocabularies. We have become such life worshippers, we have very little desire to depart to be with the Lord. Paul lived life to the fullest. To him, life was a gift, and he had used it well to fight a good fight.