Having to lose it all to live again is extreme. It's not a shock to the system. It's death.
The person who once lived in the shell is gone. To be replace by a new tenant. Untried, unpredictable and unsure. It's not a reinvention of the self but it's getting to know the new person that's moved in.
I know why the phoenix has to rise from ashes. No rebirth can occur without annihilation.