<snip> This got me thinking, what tasks are relevant in a survival situation? I just don't think I know. There could be a whole bunch of stuff - it depends where you are trying to survive and what you are doing. Certainly, the type of tasks that a backpacker or trekker uses a knife for would be relevant, but so would the tasks that a hunter does, and probably a general handyman as well. But the more you think about those varied types of situations, the less likely it seems that you would actually be relying on one knife as a multipurpose survival tool. You would need to be on your own, in remote wilderness, without a vehicle, and having to live off the land, all of which seems very unlikely. The most likely way this could come about is if you were already in the wilderness for the purpose of trekking or hunting, and somehow gotten lost, and then needed to live in the wilderness for a protracted period of time with very limited resources. Generally, this situation would befall someone who was inexperienced in the outdoors, couldn't navigate and hadn't make contingency plans if anything went wrong. If that person was a hunter or trekker, and was a knowledgeable outdoors man, they would have selected a knife primarily for its hunting or trekking capability, not for survival purposes. Their knife would not have been chosen for its ability to smash large bits of wood into smaller bits of wood. Nor would they select a knife based on building large or complex structures, trail clearing, farming or other tasks that knives like Kukri's are used for.
All of which makes me think that a 'survival' knife might make a great truck knife, where it may perform a range of different purposes, or if it could also be used as a self-defence weapon, it might be useful tool for a soldier (or more likely, an airman or driver who is pressed for room but not for weight), but the type of 'survival' tasks that you see people using 'survival' knives for on Youtube videos seem completely inappropriate when considered against a real, as opposed to an imaginary, survival situation.