I have been in the bush in Canada on canoe trips, camping & backpacking trips, fishing and hunting trips, etc, sometimes for several weeks. They could be viewed as survival in that I am my way home, and there is no one looking for me. If I fall and break a leg or ankle, or whatever, I could die. I have been miles from anywhere, weathered in, unable to travel in the canoe, or on foot, or unable to get the snowmobile running, blah, blah, blah.
I am not claiming to be an expert, but just offering my experience, so don't jump on me.
I have never needed to dig ANYWHERE. Why waste that kind of energy?? I am not trying to be a smartie pants, but what gain is there in dulling your knife?
Splitting wood. Yes I do it, but it really is a novelty that I can do without.
In the woods, I have my synthetic clothing that dries while I wear it, and carry a candle lantern with spare candles, and a MSR stove. A fire is nice, but not needed. I do have firestarters with me in case the need does arise. If I need dry wood, I can always find it by looking. If I am too lazy or tired or injured to look, I can use a small knife to split smaller logs. Then I get a small fire going, and dry the bigger wood.
Plus, a fire is guaranteed to burn little holes in your expensive nylon clothing.
If out on the land in the arctic, you better be able to rely on your clothes because rock and snow do not burn well. There are people up here, and they cannot build fires, other than small oil ones. They have been doing it for generations.
I think the need to chop and pry and dig with a knife are getting way overinflated here. A knife is for cutting. Remember the old adage "right tool for the job". Maybe the knife can be use as it was intended, to carve a more appropriate tool for the job...
I am not saying that you should not rely on your knife if the need is there, but I am saying that the need almost always isn't. That said, I cannot speak for the desert or Central American jungles because I have not been there in a survival capacity. But in the forests, lakes and rivers of North America, you can survive without abusing your tools, and it is not any harder to do. Safer, in fact.
Jim