The idea that entertainment could be all engrossing and some forms of entertainment addictively destructive to our well-being? That we could have cameras in video conferences but would want them effectively off? It was delightfully/scarily prescient in some ways.
Actually I wish people would lead with this more: because it's a book about entertainment and how some forms of entertainment addictively destructive to our well-being, and that's why it's relevant today.
I see a lot about David Foster Wallace and "it meant a lot to me personally at once time" but very little about its objective merits (which are real to be clear).