The only reason to revive the dead
So the dead are in a place they need rest. Unholy revive and keep if unwilling only revive in the event knowledge must be gained that's can't b otherwise l. To accelerate the advancement of mankind just to pick the brain of an ancient Einsteins previous life. Then back to dead they go wooden stake to the heart back in the ground. It is not preferable but to avoid having to wait the trillion year reset to gain that knowledge again a couple minutes time shouldn't be too bad. Example to extract the knowledge of the library of Alexandria. To revive the pharaohs whom indicated they'd be back. Might be necessary.