>I know this point-view might be seen as judgemental,

It is judgmental.

>it's just that I see people not contributing back to society with their work-time as not giving it all

Child-rearing has societal benefits. It's one of the key reasons why children from two parent-households do significantly better on average than children from one. Either they get the benefit of dual income or a full-time parent.

>I've heard my ~84-year-old peasant grandma' saying that she was very upset that her legs were hurting her because she wanted to continue working

I believe that but it's a choice.