People who aren’t super healthy don’t typically feel like drinking lots of caffeine. I think that’s a more likely explanation than caffeine having tons of assorted health benefits.
So, your theory is that all the humans over the course of history who consume caffeine do so to mask generally bad health?
Can I guess that you yourself don’t drink caffeine?
The longest I've made it is four months. Currently a couple weeks back drinking coffee, about to quit again. It's ridiculously hard.