I think the point is that at the time of all these innovations (factories, automation, computers) it was never clear what careers people would be freed up to pe

I think the point is that at the time of all these innovations (factories, automation, computers) it was never clear what careers people would be freed up to perform. Surely "web designer" could not be envisioned by the people who were worried about automation 100 years ago, but here we are with under 5% unemployment.