This is very true. I have LPR (not GERD, but often mistaken for it) and reducing coffee consumption to reduce stomach acid production is the driver here. Tea can, I'm sure have benefits... but what kind of tea? You can make "Tea" out of anything. Coffee is very specific, Tea is way to general. You would have to study so many specific types of tea to see where and how much benefits exists.

Tea is awesome. It has the caffeine, but has another drug which is more calming. For people who get a bit manic with coffee, tea is often the thing that works for them.

L-Theanine one of those other drugs found in green/black/white tea, and it produces a calming effect. The Japanese even put it in bubble gum.

GERD?

commonly known as acid reflux