"Franco, you misunderstand the point about Mallory"
No, you failed to understand your own comments...
The Mallory example does not work because he used 7 different layers (wool and silk) CLIMBING not sleeping, besides I am convinced that him and Irvine died of exposure.
Again his sleeping bag was made with Eider down, the warmest down you can get. So of course different temps but very different day to night layers too.
At 45f I can, and do ,hike around with just a 190 Merino T, can't stand around camp with just that at 65f and would need to be 75f to sleep with just that.
BTW, those wool mummy shaped army bags are about 3.5 lbs targeted for 45-55f temps if sleeping fully clothed.
What we are trying to tell you is that you can do those temps for half the weight and without using your day clothes with synthetic and even less weight and bulk with down.
And since you also missed understanding the content of your own video link too, that guy just showed how to roll and unroll his new blanked , he did not demonstrate or prove that it works in your or any temp.
Build a lean-to and an all night fire and that blanket will work because that is what those survivalist/bushcrafters do.
(yes the lean-to and fire are small details as in oh BTW....)