how about this..when you pour boiling water on a tea
bag the temp gos down fast and the bag just "steeps"
in hot water,the tea rehydrates as the dry leaves open and
release the oils and caffeine..same with loose tea in a pot.
with coffee however you want to avoid having the grounds
in boiling water for very long because that will release too
much of the oils and make for a bitter brew..which is why a
paper cone works so well and cowboy coffee boiled in
a tin can is so nasty..so leaving a bag of coffee in hot water
long enought to get a strong brew will also result in a bad
cup of coffee that will be lukewarm by the time its strong
enought to drink..warm,bitter coffee--blawww.
i did try coffee bags and went back to tea..
by the way my old Scots Grandma boiled her tea ..that
would make your teeth feel fuzzy..