Forget saving for retirement, even if that is the stated reason. Perhaps people are actually saving for the sake of saving, and it happens that they start using the savings when they can work no longer.

Why save at all? Maybe to help your children when they need your help. Maybe it's fun.

That said, everything depends on what you want out of life. If you must believe that you will live on after death through cyropreservation, then it makes sense live and let freeze. But I would rather choose to prepare for a situation where cryopreservation is not possible within my lifetime, until I am convinced otherwise. I'm not yet convinced.