I've never understood the design myself.
It seems like one of those things that because somebody famous used it, and swore by it, it becomes a cult object. Never mind that it most likely is no better than many other designs for general camp and game use.
I think the more modern times produce more young people who did not have a background in the outdoors by the time they got to adulthood, and so they read and copy what others used before them. Thats okay, got to start someplace. But keep in mind, just because a guy in the late 1800's swore by it, don't make it perfect for you. In fact, in George Sears did not really come up with the design, its basicly a slightly rounded off sheep skinner, a knife that was around long before the Nessmuck thing.
George Sears was a bit excentric, as was Kephart, and others. Thier choices in gear were good for them, but that may not be for everyone, nor does it mean they made the perfect and right choice. Lots of buffalo skinners used out of the box Russells Green River butcher knives, and got by very well with them.
I do think his choice of a sheath knife and small hatchet are almost the perfect companions for 99% of woods situations, but theres a wide choice of designs and brands to choose from that will all work as good as any other choice. A mora and a GB, or an Old Hickory in a homemade sheath teemed up with a Fiskars hatchet will do to.
I've never understood the cult worship of a modified sheep skinner.
Truth is, most any decent knife and good hatchet will do the job equally well.