At least in the US, most aircraft have internet now - many people are not offline. And even if they're not paying for the internet service, a number of airlines deliver their free entertainment services through personal devices - so they may be watching the same sort of content that would be in a seatback TV on other airlines.
Speaking personally:
I also tend to just load entire books onto my phone for flights. Reading on a small screen doesn't bother me.
With regards to talking - I like talking to strangers. However, the plane is one of the few places I try to avoid striking up conversations. People around me having loud (and it is loud, because talking quietly on a plane is impossible) conversations for hours about nonsense is something incredibly annoying to be on the receiving end of. While I enjoy actually having a conversation, I also know that by doing it I'll be annoying a half-dozen other people not involved in it but forced to listen to it in an environment where they can't do anything to escape it, and it feels rude to do that - especially since I don't enjoy when I'm in their position.