I used to be a big fan of cryonics and leveraging technology to become immortal.
Today, I am the opposite. I take comfort in the fact that I am certain to cease to exist at some point.
On a broad scale, immortality is bad for human progress.
Look back in history and pick your favorite era to live in, forever.
Think of the people in power in that era, they will not grow old and die, they will never be forced to abdicate their power or resources to the next generation.
Their ideas of morality will be enforced to protect their monopoly on power.
Or worse, it will be replaced by the first group willing to do such enforcement and 'weed out' those 'unworthy' of immortality.
Want to live under the rule of King Whoever, long may he reign?
Want to live under the moral code where dark skinned people should be owned as property?
Want to live under the moral code that kept women barefoot and pregnant and never voting?
If we have immortality, our moral code stops growing, and we become the tyrants that rule future generations.
We like to think of ourselves as inclusive and progressive, but we've still got a long way to go.
How do I know? There are still people in the world who are suffering.
On a more personal scale, understand that immorality is the same as simulation.
Re-instantiation (creating another you) is how death is avoided.
This might be nanobots building or repairing a meat-based you.
Or it could be a very advanced quantum computer simulation of your consciousness as embodied in the neural network encoded in your meat.
If you think of modern computers running emulators for old video games, you're not far off;
just treat your own brain as the ROM, and imagine you're being 'emulated' so well that you don't even know you're not you.
(Here's an interesting side thought: What if you are already being emulated? How would you even know this vs. what you think is reality?)
Here's the issue. People already have enough trouble treating each other right when they can see each other in meat form.
People love to divide themselves into groups and justify hurting the other group, even though they know those people are fundamentally no different than they are.
Now, enter the 'emulated' person. How do you think people will react to that?
I think they will treat emulated people just like characters in a video game; no empathy, it's 'just a computer'.
So sure, put that emulated consciousness in an emulated tank of boiling water, I mean, it's not *really* a person, right?
Your meat self will denature and die within seconds of being submerged in boiling water.
Your emulated self? That depends on whatever the person running the emulator wants; you might be 'boiling' for a long, long time.
And, one might argue that human morality will progress and simulated people will be given proper equal rights.
I refer back to my argument that our moral progress will stop (and probably decline) the moment humanity gains immortality.
I am very glad that my own meat shell has a limited finite existence.
For both my own selfish reasons, and for the selfless reason that in order for humanity to progress, I must die and let the next generation have their chance.
So it goes.