Caffeine is beneficial; it's not just a feeling. It has a neuroprotective effect shown in animal model of ALZ and a statistically significant effect in humans that decaffeinated beverages don't provide.
https://www.mdpi.com/1420-3049/27/12/3737
https://www.health.harvard.edu/diet-and-nutrition/harvard-st...
I wasn't meaning to say it's not actually beneficial, I just don't like how often people get dependent on it without realizing. (As in, I wouldn't really mind if people knew they are dependent, but being completely oblivious to it is sort of offputting.)
There's no such thing as a bad food, only a bad diet. Chocolate is also considered neuroprotective. Food is medicine.