The industrial revolution increased the pace, but it was already there, not flat or randomly flunctuating (think ancient hominids versus early agriculture vs bronge age, vs ancient Babylon and Assyrian empires, vs later Greece, and Persia, later Rome, later Renaissance and so on).
Post 1970s most of the further increase has been based on mirages due to financialization, and doesn't reflect actual improvement.
Of course it does. It would be good if you would try to actually support such controversial claims with data.
The world can produce more things cheaper and faster than ever and this is an economic decline? I think you may have missed the other 6 billion people on the planet getting massive improvements in their quality of life.
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.