A machine that helped people create rather than just consume, even simple things like having an inbuilt dictionary. We still have that but it is always running off to the internet to do what was done in 1987. And that leap to something external is not just for convenience, it is a leap of how we used these things.
Like Rushoff, for the last 15 years I have been trying to figure out ways to return a little of that of that isolated but functional style to computing. I no longer try. Every attempt has just been meet with further disappointment. Unlike others here advocating for pushing through, I don't think we can. In pushing through it is merely providing more fuel for potential missuse.
I still use modern technology but only that which is basically forced on me by the rest of society. Even then its impact is minimized - I think Hacker news is the last regular thing I really engage with in this space and that is slowing down with time as well.
Maybe there is a part where spectacle is the main driving force that allowed these technologies to become so pervasive in our world? That is to say that if we never went down this path computers would be treated more like we treated type writers. A neat tool but something few would get obsessed with.