To me, alienation is philosopher's toy and they like to put what they don't like behind that word. It's been mostly used by Marxist philosophers rediscovering the "young Marx" to deal with the fact that the workers actually didn't seem that interested in a socialist revolution anymore (they have false consciousness !)

I am not saying this to invalidate what you are saying but would you care to explain how you think the problem described by parent (richer societies allow for more alone time thus loneliness) is better described by Arendt's concept of alienation ?

> In the modern world [...] Is it any surprise?

To me you are just describing a poverty and ideological tribalism but that still doesn't tell me what Arendt can do for us here