I think when most people opine on tea there's an unspoken, and often unrealized, assumption that it's uncaffeinated tea. Because often when people discuss the relaxing aspects of tea or making tea what's really being described just seems like a purposefully self-occupying nothing action that offers little in the way of chemical stimulation. Which is fine, I'd agree such things can be both relaxing and good for giving ourselves time for certain kinds of reflection, but try it with a competitively caffeinated tea and I suspect the reality would be much less relaxing than the hypothetical.