If we refer to a PSK as the lofty survival tin....They arent much use in UK, even in wilderness, mostly because too small to be usefull. In the UK selter against climate is main concern and a tin cant do that much...A lot of tins have fishing kit whoch is hardly ,uch use in UK
The origion being for use by downed airmen, as parts of light vest, or worn as art of escape kit ( although nowdays its an escape belt) where the basis is you drop your bergen when you engage enemy, and if your forced away from position you wont be able to go back to reclaim your pack, and need to live off belt...
Hardly a situation in the UK....
A larger survival kit, but not PSK , i can see as usefull on cycling/boating trips in larger countries...
daypack size kits i can see as being usefull in the UK. mostly for protection from weather....food wouldnt be an issue, its very feasible for hikers to have an accident and have to wait many hours and having some kit is simply sensible...you dont win points by not being prepared....
Having a small kit of redundancies, a possibles kit is usefull for any outdoor activities, but its not neccesarrily a survival kit, just means if your main bic lighter dies you have spare to not ruin a trip....things you may not need on evry trip, but makes things more pleasant just in case....sunblock, insect repellant etc....appreciate this type of redundancy more likely with preppers, bushcrafters and less likely for ultralighters
First aid kit....most of the time when im out im working with tools, leatherman on belt so i always have a first aid kit whenever tehers tools...im not going to wait around for a client to to find a FAK , fill out form, all the while not being paid, or worse drip blood on clients carpet....just stick on a plaster and carry on, thats hssappened many times, im not going take time out form an onsite job to wander to a high street shop to buy plasters i already own....
does a plaster affect surival....no....does it help...yes....
one way a kit can help survival is driving....my mother was kileld by a tired driver. at the court case the drivers...white van builders hadnt drunk enough water for the weather, were tired and didnt have anough coffee at teh worksite...and so in tiredness drove on wrong side of teh road
so in my belt FAK i always have cafeeine pills, and pain killers and spare contact lens , sunglasses to make sure there is NEVER any hampering of my driving ability, no matter what vehilce im driving....
ive recently made my fatehr carry a torch at all times, because if he falls over one more time he will be wheelchair bound....the argument that he could go in to a shop and buy something is invalid argument. Also he now has phoen attached to him at all times....one time he was lying in living room for 5 hours with broken hip and my stepmotehr wa soutside gardeniing....so in his stuation walking stick, heart medication, phone and torch arent just convenient edc, they are vital for survival, or at least avoid pain and suffering
but again not a PSK tin....
i cant stand the idea of popping in to a shop to buy something i already own....like the idea of buying bottled water....thats what canteens/water bottles are for....so yes you could pop in a shop for convenience....but sometimes it can ruin a day spending time trying to find drink/snack etc and end up late for soemthing....or feinting because of lack blood sugar, various avoidable situations
saying not to carry edc kit because you can buy things or people will help you could be argued why botehr with a bow drill when out in the woods when you can just buy a lighter, because you want to use a bow drill, because you dont want to have to rely on bought kit, or rely on a lighter always working... you coukld say why bother with a tent while summer camping, if weather changes or it rains just drive home....i know people that have done that.....
Theres lots of reasons not to carry to much kit, ultra lighters....or in urban setting not carry much edc....( visiting a museum where knives arent allowed)
Everyones situation is different, and we cant gatekeep what people should or shouldnt carry.....i persobally dont see the point of historical flint and steel in a modern survival type kit, but ive seen videos of people including them, they make sense in bushcraft kits however.....
There are lots of factors thats makes some things vital in every day life that otehr people dont appreciate...for me communication to my wife when im working is vital....i carry battery backup for phone on me, in car and pretty much every possible kit, i carry a backup dumb phone in case main phone diess, and even been thinking of getting an inreach or similar even though i hardly ever go anywhere wild, in rural somerset tehers plenty of mobile dead spots, but needing to keep wife updated on my location is vital.
so everyones vital/emergency kit is very unique, and theres many variations, its a very interesting topic, and for me organising kit helps my ADHD