The issue isn't about realism of hypo/hyper, it's the fact there is a bad balance between the two levels. If I'm overheating and have to sit in a pond to cool off, that's fine. But, if I become hypothermic immediately following cooling off and now have to sit in front of a fire (which eventually makes me become hot and overheated) then there's an issue. I want the realism, but I don't play dayz to swim in ponds and sit in front of fires for a majority of my game time.