> Coffee is a universally available, productivity enhancing commodity
The analogy carries further than you intended. If you have never reached addiction stage, then there is no factual productivity enhancement. "But I'm so much less productive if I haven't had my morning coffee" Yeah, because you have an addiction. It sounds worse than it is, if you just don't drink coffee for a few days the headaches will subside. But it doesn't actually enhance productivity beyond placebo.
It does objectively improve productivity though, beyond offsetting withdrawal.
https://www.sciencedirect.com/science/article/pii/S014976341...
I'd be interested to know what the controls were for those studies. Were the participants already addicted or was the 30mg+ dosing done on non-addicted people? It's a lot of studies to pour through.
Also, that is a lot of metrics!
And it seems that the athletic performance increase to get statistical validation (for any person) is in the grams range. I ... I just can't see any reason to take that much caffeine unless I'm at the Olympics. I'd be jumping out of my skin!
I'm not so sure. The stimulation can also self-medicate for people with attention issues. I've tried quitting coffee before for weeks and I get so spacey it is difficult to work on major projects. I try coffee again and suddenly I feel quite capable. Perhaps I didn't quit long enough, but at this point after multiple attempts quitting with similar results, I've just accepted it.
Because you haven't detoxed long enough. Try 1-2 months - you'll be shocked by the clarity, stability in energy, better sleep etc