> Tea, especially green tea, doesn’t have the same caffeine bioavailability as coffee – otherwise people would abuse it just as much as coffee

You can absolutely get high doses of caffeine from tea if you really want to. It comes down to the type of tea, how much is used, and how strong it’s brewed.

There is nothing special about tea that breaks the rules of caffeine. It comes down to the content of the leaves, quantity, and extraction into water.

> while even a light coffee or a caffeine pill is clearly noticeable

Caffeine pills generally have really high dosages, FYI. Even light coffee drinkers can be caught off guard by how much caffeine is in a typical off the shelf caffeine pill.