While I agree with the academic info, the reality of the situation and the application has given us some truly worthless "innovations."
For example, we spend an inordinate--and wasteful--amount of time, our debating oxygen, and expensive metal in creating "fighting knives." Unless you're in a retrospective of "The West Side Story," you're not going to get into a knife fight. In fact, not one guy in fifty can properly use such a device, and is more of a danger to himself. If you need a contact weapon and know anything about bloodborne pathogens, use a wet brick instead.
Yet, fighting knives make a profit, they're sexy, and they appeal to the Walter Mitty in far too many collectors. If the technology dollar could be spent on things that were worthwhile, we'd have wharncliffes made from Star Trek materials that never rusted or needed to be honed. Instead we get a rehash of Vadalia Sandbar Fight knives, with the oxcart innovation of 1827.
If I could equipment my clients with one knife--folder or fixed--it would be a simpler 3-inch knife with a belly arc in a smooth curve, made from low chromium high carbon steel, enough distal taper for precise work and an ergo handle. You could use it to fix your kid's kid or field dress a moose.
But then, I only have logic on my side.