Interesting in the same way is the question, why didn't the techno-utopia arrive? Even 1980s technology is enough to achieve a big lot of automation that we still dont see in society
Lots of the automation did happen. Heck, the chip manufacturing detailed in the video itself is great example; pretty much all of the human labor shown there has been eliminated.
Looking at economic trends of the past 100 or so years, there is marked change beginning in the late 70s, especially in various forms of equality. Using automation alone for explaining that would be a folly, but equally folly would be to say that automation has had no economic effect.
