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reality is much bleaker
A friend from the tropics who moved to the UK told me that he didn’t understand how a cold or minor respiratory ailment was a death sentence just a century ago, until he spent a winter here. Without modern conveniences your body is constantly constantly battling off exposure to the cold, and like frankenbike says it takes a big physical and mental toll that not everyone can survive after months non-stop.
I just mean that I thought I could do without, being an outdoorsy person, but in practice it was really horrible, and people probably don't realise how bad it is for your mental and physical health. If you haven't tried it long term it appears that you just have to toughen up and wear a jumper but the reality is much bleaker.