The issue is the time period being considered. I don't claim to analyze an asymptotic future after all tech change has stopped. I instead try to consider the "next" era after foraging, farming, industry. While that era might be short on a cosmic timescale, it may be long subjectively to the creatures involved.

At the moment human minds are vastly more productive than automation. Automation is slowly getting more capable yes, but with ems, they will also increase in efficiency.