I posit that you, sir/madam, are the one exhibiting poor logic. Giving up water for two weeks would lead to death. That's hardly the same as temporary mild withdrawal symptoms of coffee. That is the difference between a drug/supplement like caffeine, and an essential nutrient like water or vitamin C.

The logic is not poor at all, for quite mundane reasons. Giving up water will kill you, while giving up caffeine for enough time means it is no longer needed (and it is also, quite obviously, not needed for people who don't drink it already).

Ok, try giving up fibre in your diet for a while. Or vitamins A/B/C/D/whatever, or many other nutrients.

You’d be dead, without water for two weeks. Slight difference between a withdraw and a biological need, no?