Going in the wild is not enough to emulate a survival situation. As an evidence, vanilla Skyrim allows going in the wild.
It does, but it's exactly the same as staying in the town; The only difference is that in the wild you might get attacked by a variety of monsters, while in a town it is reserved to vampires and cultists. With a couple of mods it differs wildly (pun intended): food is scarce, warmth is scarce, and if you fall into the river while its -20C outside you better build a campfire.
No. It means having access to means and resources to live and not survive in a cold environment.
But not everything is a town. There is wilderness. There are ice covered mountains. And most dungeons, the bread and butter of Skyrim, are in these environments.
You seem oddly obsessed with them.
A mod enabling pack mules would solve that. Even better, since it is a magical world, could include a quest for a magical pack mule that comes with a magical aura to offset the exposure effects. Mods are magic, simply magic.
A mod could do that, and does that. If someone wants to play with that they can. They can't in vanilla, though.
A good thing since that mod does not provide anything like survival. At least, Skyrim vanilla is supposed to be about things like exploration which it delivers.
That mod, combined with a couple of other mods, provides the same, or better experience (although sometimes a bit clunky, it is a mod after all) than survival games on the market. If you're arguing that it's nothing like real life survival, well, duh, it's a video game. None of them provide a real life-like experience. Not even vanilla Skyrim delivers exploration like in real life. And that's OK.
You can talk about what it's supposed to be and who it's supposed to be for all day, but the fact is that Skyrim IS a modding platform. If someone likes Skyrim vanilla, it's for them; if someone likes Skyrim modded it's for them; if someone doesn't like Skyrim vanilla, but likes it modded, it's for them; if someone likes neither vanilla nor modded Skyrim then it's not for them.