So obviously this isn't a small suggestion but I think it is something that would turn survival mode into and actual survival mode. Currently all you do is kill mobs and find resources and food so you don't starve to death and can kill mobs easier. But to survive in real life it requires so much more. Obviously nutrition would be difficult to add but needing water wouldn't be difficult to add and it is a life nessesity. This would be something that should be similar for animals to. Animals need water so they should have to have a water supply otherwise they die of thirst. Another thing is to add more to farming. I'm not just saying more crops which would be awesome but rather plants needing a curtain biome or weather in order to survive. If a plant gets to little water they die and the same with sunlight. And it goes the other way to. They can't have to much of water or sun. This would make farming more enjoyable because you have to actually focus on what your doing and make sure that the plants can grow. I also think that there should be more weather. Currently it is either sunny, rainy, or thunderstorms. I believe that there should be other kinds of stuff in different biomes. One post on this forum mentioned sandstorms in desserts and that is a great idea. But along with the weather should be temperature and season changings. In a snowy biome or dessert it should still be snowy or hot year round but it could get hitter and colder. And then in the grasslands and timber is where there should be seasons. What would go perfect with this, is the player needing clothing for the environment they are in. If your living in the cold snow biome you would need wool clothes to keep from getting frostbite. This would just add a small thing that players actually have to worry about when playing. And there would be different kinds of clothes to for different environments. You wouldn't be wearing a winter coat in the dessert would you. But for the dessert I think it should be possible to get sunburned so you might want a thin layer to protect from the UV radiation. The clothes would be created in the loom. Another small feature would be sleep deprivation, so more if you didn't get enough sleep you would only have to deal with the phantoms but also fatigue and possibly nausea. And something I think almost everybody would agree with which is more animals. Especially predators, there armt any predatorial animals really and they do actually exist. Predators should also want to kill prey like wolves do with sheep in the game. I believe all this would add so much more to the game. It seems like they focus so much on creative mode now days which is fine and all but survival mode could have so much more to it that would make the game way more enjoyable, especially for older audiences. And all this doesn't need to be in regular survival, I was thinking rather a hardcore survival that way those that are just learning the game or maybe don't like the changes, wouldn't have to play the game this way. So you would be able to select survival or hardcore survival. If you read all this I would like to say thanks and I am excited to see what you have to say. Thank you.
Not in response to the whole thread but regarding player thirst mojang put that on the never going to add list