Well us dergs have very long life-spans naturally and the problem with this idea of everlasting life or even very long life that no one ever really thinks about is that the probabilities that misfortune will befall you don't go away or even really go down once you have it. That means that even though it seems unlikely to be crushed by an air-conditioner falling out of a window, or fall down the stairs, or choke to death on your food, the probability of these things happening when given enough time approaches 100%, even the very unlikely ones.

So while you might think something like this is awesome unless it also grants you the invulnerability to survive the catastrophes you will encounter in the future or cancels out their probability, it's basically useless, because those will get you likely in a comparable amount of time as old age would.