We cannot talk about net benefit until we agree on the objective: net benefit for whom?
I don't care if my current job is being replaced or the whole industry I am working in vanishes. But as an individual, if the new technology says it aims to wipe out all the possibilities of my future career, it is not net benefit for me.
Just saying "net benefit" "overall" sounds like some collectivism propaganda.
Is "Mostly-reliable" TCP connection a real thing? A TCP connection is either reliable or not working at all. That is what a proper abstraction should be like.
I hope the voyagers can last longer. We are trapped on Earth, but it is just fascinating (and relieving) thinking of them expanding the boundary of human's space adventure.