> people dying tended to not have a great quality of life (i.e. they were near the end of their life anyway)
Who are you to say a grandparent is not enjoying the best years of their life seeing their children raise children, or a great grandparent for that matter? And, children may well enjoy sharing the experience of parenthood with their parents, so the premature loss of one life can hurt many people.
Your whole take is based on a bunch of assumptions that everyone is miserable towards the end of their lives, that children and community feel no loss when elders die, and that just is not true. Life takes on a different meaning as we grow, and no age is of less worth.