Earlier quoted context omitted.
To be fair, if you cure aging, you drastically reduce (or make non-existent) the incidence rate of most diseases, since they tend to appear as you get older. I think curing aging is the ultimately smart thing to do.
> ... if you cure aging... That's a big if . We've spent millions of year evolving to last long enough to reproduce and care for our young. Beyond that, our bodies break down in all sorts of ways ("aging"), and "curing" all of them seems unlikely. Shortening telomeres, reduced muscle and bone mass, slower metabolism, macular degeneration, worn cartilage, arterial plaque... The ultimately smart thing to do would be to…
So if we could strike at the root cause, and heal DNA damage, then we wouldn't have to worry about cancer, and we would be able to turn cell division up and become more youthful. Or alternatively if we could develop better cancer cures, we could turn cell division up and deal with problems as they arise.
Now DNA damage isn't the only thing we would have to fix. For instance some poisons and junk cannot be eliminated by the body and stay with us permanently. We would need to find ways to clean them up.