I watched some of the video by peak survival, very shallow content, as if she's just reading what the label says, including the hypes (reflect 90% body heat!!!). They claim to run the ultimate survival course, but if their videos are any indication, spending a day reading the Internet would beats their course.
With proper rigging for the type of water and the expected type of fish, it's not that hard. You can run a trot line across a backwaters lagoon with a couple of treble hooks and a dug up crayfish (actually, I would eat the crayfish...they are excellent boiled or steamed in wet ferns) or some dead fish parts from the shoreline, you can fish in the little streams for the ever-present creek chub with a long stick, a 10 foot line (even one made from paracord strands), and a snelled hook baited with a bug, or you can spear a slightly larger fish with a frog spearhead lashed to an 8 foot pole. In this area, there's guys who backpack into the boundary waters just to fish. Why not keep the option open in a survival kit?
When you say "It's just one of those staple things in survival kit that nobody uses" Couldn't you say that about almost everything in the kit? You don't need it until you need it.
I said most people, your type doesn't count lol. How many people in the general population know how to do any of the things you said with just a bit of line and a few hooks?
As far as kit content is concerned, it's probably the least likely content to be used, too much limitation by location, time of year etc., and even then not everybody knows how to use one. But I suppose the same thing can be said for snares.