MOST people can't carry a fixed blade around with them due to a variety of reasons these days so your point isn't valid for the general public or the majority.
That FB won't do anybody any good if it's sitting at the house when they aren't home now will it?
If I'm going out somewhere where I am actually going to need the strength of a fixed blade, or potentially need it, then I take them with me. That would be a place where other tools aren't available, given that Hard Use generally means Abuse because the right tool for the job isn't available. They are in my emergency kit. I don't go hiking, or camping without them.
An Izula is a small fixed blade, far more capable than any "Hard Use" folder, and easily as stowable. It is one of the fixed blades currently in my waterproof camping/hiking emergency kit So in reality, in my opinion, all the hard use folder stuff is crap. Show me an environment where you would realistically require strength that the average folder doesn't provide, and I'm willing to bet it is an environment that you could plan better for, and carry a fixed blade instead.
And no offense (really I respect you, and your contributions), but your videos in particular while showing ways to break folding knives, really have very little to do with reality or actual situations requiring a strong knife.
To answer the Original Poster: I think this "Hard Use" knife thing is just a big machismo thing where people want to believe they have some kind of security provided by a tool that wasn't by it's very nature designed to be used in a manner I consider "Hard Use".
Hard use to me, is being stuck in a situation where you have to use a knife to endlessly cut hard materials like wood or metal, while retaining an edge, or used as an axe, prybar, etc. repeatedly without servicing or tools to repair the knife. Fixed blades are infinitely more capable when it comes to extreme abuse.
Show me a folder being "Used Hard" without refrain, and I'll show you a broken knife.
If anyone is willing to take the challenge, go ahead and send me your hard use folder, and I'll put it up against one of my fixed blades in a real Hard Use (and likely) scenario and we'll see how long your knife lasts.