How many 'knife fights' have you been in?[/quote
None, and neither has anyone else. The topic is often discussed in terms of conjecture. I'm not sure I've ever seen an article where Jerry Vancook (a real expert) claims that he has direct knowledge, but he sure has years as an instructor and LEO.
But I will tell you this, I do service knives for guys who do use them. When I sharpened for our local Gander Mountain I serviced about two dozen knives for young soldiers (and Marines) were about to be deployed. Perhaps 200 for local LEOs.
The type of West Side Story style "step into the light" type of knife fight never really happens. In fact, I have been in several hobbyist forums where that very question has been asked, and no one had personal knowledge.
But we do have knife attacks. And knives are getting better, and the better ones are getting more affordable. And the better the knife is the better the chances it will take and keep a better, sharper edge. And that is something I do know about.
And let me address the issue of a "superficial" knife wound. If there is such a thing, we should notify ER staff. Knife wounds are serious. Deep stab wounds injure organs and increase the chance that a wound is ultimately fatal. Knives are dirty, and wounds produce blood borne pathogens. Scalp cuts bleed like there is no tomorrow. (My SIL is a Red Cross nurse.)
Woe to he who has his femoral artery sliced.
Even minor cuts are serious. Consider that in a real situation. An attacker slashes with one of my knives, and you successfully block it with your forearm. I suppose that's a minor cut, because he did not reach your vital organs. Just exactly how many forearm wounds are necessary before the condition is really serious.
My final point in this debate is the knife's ability to puncture. A good knife will ease itself through kevlar without any true resistance. For the purposes of this discussion, we have paired this to a .25 ACP. Most of the vests I've seen advertised try to equate their safety ability to a .38 SPL or a 9x19mm.
But debates aside, we should be helping each other. We shouldn't want any of our friends here to get cut or shot. My position is that we shouldn't teach or poo-poo that a knife is some minor league tool. I live in Wisconsin where there is no CCW provision. I carry sharp knives of superior design. I consider them a lethal weapon, and so should my mugger.