If it was a simple 1 - 3 clicks to fill your bar, you wouldn't feel the need to refill as often, you wouldn't be as exposed to others because you neglected your character's thirst, and this isn't a traditional (see within the last 5 years) where everything happens quickly because we're all impulsive now.

I like that it takes a few extra actions if you neglect your character. I like that it breaks the current trend of everything should be action-packed and quick. Just my opinion, of course.