It's not just the reviving, it's the original preservation that's most important as a first step.

As I said earlier, if people are dead, they're dead, gone. That's not the same as suspending animation. That would mean making a decision to suspend your life at that time.

If you die, something killed you, whether that was a major failure, disease or just "old age", you're dead. You'd have to reverse that to be able to begin revitalising someone presuming they'd been "preserved" the "right" way.