And yet people still die on Star Trek. There were a few that even Crusher couldn't bring back even though she got to them soon after death.Man, we've got dermal regenerators (for skin, muscle and tissue), synthetic and genuine blood (for transfusion), donors and artificial organs (hearts, lungs, etc) and mental stimulators for brain death. To say nothing of nanoprobes, super blood, eugenics (see Bashir, Chakotay, those kids in Unnatural Selection).
Kirk voice: "Death... The ultimate enemy of man. Has been conquered!"