I was actually hoping someone would chime in and say they carry a Bk-9 or a Dundee-knife just so I
could ask, "Are you for real? Seriously?"
What's wrong with carrying a BK-9? If that's the knife that a person owns, if that's the knife that they want to carry, if that's the knife they have a use for, and if it's legal, why should anyone else judge them, or even care? Isn't it bad enough that we who carry knives, any knives, face the negative judgments of non-knife people without judging each other based on knife choice?
I EDC a fixed-blade everyday. Sometimes I carry one with a 4 inch blade, sometimes one with a 5 inch blade. I use them rutinely at work to cut things that require a stronger knife than my EDC folder, or when I have a particular dirty job to perform and I don't want to have to clean a lot of crap out of my folder. I also use them outside of work for the same reasons.
As far as survival knives, while it's true that any knife can be used to save a life, I would not necessarily describe every knife as a "survival knife". If I were going camping deep in the wilderness I would carry a knife that I could depend on for my survival if that should be necessary. I would want it to be a multi-funtional knife, one that I could use for woodwork, prepping small game, clearing brush/cutting a trail, even digging (I've seen cases of people falling into narrow ravines or crevices and using a knife to dig hand and foot holes in the side to climb out). Basically, I would describe a "wilderness survival knife" as a knife well suited for any wilderness emergency that one might find themselves in.
For an "urban survival knife" the possible uses are fewer, after all, it's not like anyone has to build a shelter, start a fire, or skin small animals for supper. The fixed-blades that I carry have sharp edges for any cutting that I may need to do, and they have relatively thick blades which I like if I should ever need to perform any emergency prying.
The little Swiss Army knife that I carry on my keychain could be used to cut myself out of a seatbelt, but I wouldn't call it a "survival knife". In general, I might describe a "survival knife" as a knife that one is prepared to depend upon for their survival. In other words, would you be willing to bet your life on
that knife in an emergency survival situation.