There is the other possibility that although caffeine has been historically helpful for accelerating speed of thought and human development when our culture was less complex, we are now reaching a point where human society has become so complex that caffeine rather contributes to the overburdening of our limited cognitive capacity and making us lose sight of the forest for all the trees. You can see evidence of this in sciences and other areas where progress appears to be speeding up but is simultaneously becoming more trivial. But I'm still not sure that caffeine is a culprit here since the few truly visionary thinkers we still have (like Ray Peat and Elon Musk) all consume caffeine.