Even if death is on balance a good thing, the process that precedes it of your body and mind deteriorating over several decades is not. It greatly decreases quality of life and increases medical expenses. A world where people enjoyed 80 or 100 years of good health and were then painlessly euthanized would be a huge improvement.

Also, COVID-19 would be barely noticeable if everyone had the risk profile of 30 year olds.