What is the purpose of modular shelters?

[zokiHR]

So I like the idea that you can build your own shelter, that's nice although building is kinda odd so you cant build in many places due to terrain. When you finally build your shelter and it takes too long but that is realistic and I like it, that you go kinda explore and when you come back you see natives destroying my camp. They destroyed almost everything and they are quick in it and its stupid that 5 guys with wooden spear can destroy multiple mud walls building.
So what is the purpose of shelter, there is NO, it's just cosmetic and its there that you spend time because survival mode on hardest difficulty is easy and boring so they put building in game so you can spend time.
I thought that shelters will protect you for example normal shelter from everything but the arrows, and mud wall from everything only mud windows can't protect from arrows but they don't even have doors, so funny, animals coming in and out.
I would like that they change those things needless to say all the bugs and low fps drops and it's not EA anymore.
If someone like hardcore survival play The long dark interloper mode, best hardcore survival ever.
Compare to The long dark , Green Hell is kinda funny game , kinda The forest but with natives instead.