I think you make a good point. I tend to put together the E&E type kit for fun, or for times when that sort of situation is a distinct possibility. Hence the reason I don't think of commercial air travel, carry-on survival kits as a joke. If you survive the crash, you have the possibilty of being stranded about as far from assistance as possible. This is especially true of the puddle jumper I've occassionally had to take from Denver to Laramie. For this example, I'd carry something based on the PSP, probably with wire saw, safety matches, EMT shears, paracord, water bottle and extra first aid supplies. Once I get through security it all goes in my pockets in anticipation of not being able to take my bag with me when I'm getting out of the plane.

On the other hand, when I go hiking, I don't bother with a "kit", though I usually carry approximately the same gear everytime, my ham radio, a freezer bag of bandages and gauze pads, extra clothing for foul weather (or the time I wandered into a bog and needed to change socks and pants), a butane stove, water and snacks; sometimes my pistol or hatchet or a blanket. All this on top of what's normally in my pockets. It's not a survival kit, if I'm peckish I eat the snacks or make hot chocolate, if I get bored I'll see if anyone's listening on the radio. What it does is keep me comfortable both for what I plan on doing and in the event of unplanned difficulties.

I think the concepts of the two are distinct all thought the intent certainly overlaps.