1) Yes, i now, too, understood this view, but, ironically - this as times the that i perceived utterly otherwise, i as times thought that the right perception of this when these indicators are on the screen. And precisely for the reason that you described.2) A strip of food and water is usually the standard for survival games ... this is the first time I've seen such a strange approach implemented in A13. And seen nowhere else.
3) This directly affects the stamina, and not the other state. To stamina more suited level of water. If was would so - i still would understood.
4) Yes .... but, in reality, it makes people who are diligent in this regard, constantly climb into the inventory to open the page of the character and find out exactly his statuses. I agree that for careless people it is not important. (translator! no offense)
About the UI.
for A16 has exactly the same interface as any alpha after A12. I hate this design since A13.
Although i must admit, the possibilities of modding this GUI cover all its shortcomings