4C is hardly severe cold; even 4F isn't severe.
Not severe!! You wouldn't catch me dead in 4 degree weather. My fingers would be frost bitten in no time.
I have an LG V10 I just bought and it does an admirable job of videos I do of my dog. The back camera is 16MP...good as the D7000 Nikon. I wouldn't know where to start attempting to upload them to the computer. I'm good to be able to make and receive calls on it.
At 49 years of age I doubt that there is enough time left for me to wear out the mechanical cameras I own.
You're just a youngin'. I'll be 70 this February and would give a months pay(if I was still working) to be 49 again and feel and look today the way I did then. You've got a long time yet.