If you are bushcrafting, you went there by choice. You know pretty much what chores your knife will need to perform. These include processing game and fish, making feathersticks, working wood for pot cranes, shelters etc. Cutting cordage, and digging splinters. And possibly batoning wood if you believe the hype or have absent-midedly left your hatchet and there are absolutely not twigs in the woods.
I guess in a survival situation, if you have only one tool, you just don’t know what demands you will place on it. I cannot imagine all of the demands these would be. But splitting wood might be one. Hammering your way out of something like a car. prying something so you can get your foot free of some trap. I dont know. These are all theoretical situations. It seems to me that you might want a tool that is over engineered and stronger than it might need to be. The Becker BK2 and the Dozier WIlderness knife comes to mind. These are broadswords, not scalpels. Neither would be my first choice for field dressing game or fish, carving, making a hand drill, or digging porcupine quills out of your leg, but it could do these jobs and a bunch of much more demanding jobs. It is difficult to break a BK2 and you could baton all you want with it. But using it for fine work feels a bit like taking a Unimog out of a race track.
Or I could be completely off base. It happens a lot.....