As an academic point of interest, this may be a legitimate question.
In reality, I wouldn't second guess what those guys went through to see if carrying a bush craft knife or Altoids box with fishing gear, a teeny knife and a metal striker rod in it would help.
They were losing digits to frostbite, they were unable to have fires since they would give away their positions to the enemy, they didn't have the proper clothing, little hot food (if any) some were nursing injuries that required more than just field aid, and all were literally fighting for their lives.
I wouldn't belittle the skills that many here have or practice. But I would certainly submit that the skills learned under extreme combat conditions are completely different. We are not in the controlled panic of combat. We are not thinking in the back of our minds that a false step on our parts could get a bullet to the head.
Now add the fact that many of us go out for a day or two, sometimes just an afternoon, and compare that they were on station in horrible conditions for weeks. (And let's not forget that incredible force march that their relief made with full gear to get to them in the same conditions).
When I use to do some distance hiking, my personal experience was that a nagging problem that starts out small ends up big. I tiny blister from a sock seam can become a big open sore in just a couple of days. And infected cut that would be little to worry about if cleaned properly and covered is a big deal if your first aid kit is lost. Craving for a hot meal can be huge, and remember that they were literally freezing to death for weeks, and losing fingers and toes to frostbite. Although we practice survival skills (safely though, we don't want the SAR guys looking for us) for an afternoon or a day or two, those guys did it for weeks while under fear of losing their lives.
I don't recall any here practicing their survival skills with little cold food, the wrong equipment, in below freezing weather while under fire. It isn't the same conditions at all.
Remember too, they were in defensive positions. So almost everything they did was being monitored by enemy soldiers. No freedom of movement, no fires, nothing allowed that would draw attention to their positions.
I don't think there is much more those guys could have done for themselves. I wouldn't sell them short on ingenuity to get by as well as they could, and certainly wouldn't second guess their efforts knowing their conditions.
Robert