I speculate that there may be anthropic reasons for some of the stagnation.
In particular, I suspect the slowdown in growth of energy production may be what we would expect to see because in worlds where energy production grew faster we would have also had more abundant and more powerful weapons that would have been more likely to kill more humans, thus making it less likely to find oneself living in a world where such growth didn’t decrease.
I speculate that there may be anthropic reasons for some of the stagnation.
In particular, I suspect the slowdown in growth of energy production may be what we would expect to see because in worlds where energy production grew faster we would have also had more abundant and more powerful weapons that would have been more likely to kill more humans, thus making it less likely to find oneself living in a world where such growth didn’t decrease.