D&D has long taken the stance that HP is not meat points....be it a monks ki or just leveled experience that trains you how to take less damage when you do get hit. Of course many debate it and add critical hit/fumble tables to do wounds for more realism, but that simulationist view goes against the gamist view what HP really are. And HP do get to be a silly argument against ranged weaponry, that you dodged the bullet from striking your heart.
I am hoping that Planet Explorers adds thirst (they need to improve water collection), they already have hunger (combined with tired), and they really need to get Adventure mode more focused on survival first. Make the biomes themselves more different, deserts need more water, mountains you can freeze, swamps you can get poison bites.
The trick to doing these things is make it so that you can have ways to mitigate death with preparation. I once played Skyrim with FrostFall which freezes you if you have no fur, with Alternate Start which gives you starting equipment in a random location. Started in a frozen cave near a frozen town and died before I could even make it to town, because the modder had no idea it should start me with fur (with no way for a noob to skin and kill a critter, because you had to buy the survival camp with portable skinning in town!)
Naked and Afraid is an entertaining show but even they have medics standing by if you get bit because dead players is not fun to watch. Most survivalists go in prepared, where it gets interesting is when you are insufficiently prepared for the unexpected worst.