I think you have missed that it's easy to get "massive improvements in your quality of life" if you start from merely-post-revolution-era China or 1950s Africa or colonial India.
Much less so if you plateaud as US and Europe, and live off of increased debt ever since the 1970s.
Increased debt is mostly on the good that technology cannot at least yet reproduce. For example they aren't making new land. Taste, NIMBYism and currently laws stop us from increased housing density in a lot of places too. Healthcare is still quite limited by laws in the US and made expensive because of it.