I think the point of a PSK was the minimum a soldier needed to survive and the reason it was in that tin format was you could keep it in a combat trouser pocket so it gave you the option of dumping everything to make a run for it. Lofty's version I think has the same idea it just got more in it and bigger.Personally, I don't carry a specific PSK 24/7 but when I'm out and about the kit I do take fulfills that role. For me the PSK is more of a military thing where you might get caught out "on the run" with nothing else other than PSK. Of course, if you spend a lot of time in wild places you should have certain emergency items about your person, I consider that normal preparation. Any emergency items you do carry should reflect your knowledge level, where/what you are doing. I don't see anything wrong with carrying a PSK if that's how you have prepared yourself for emergencies.
I think this is sort of my point, a psk in London does not work however edc does. Anyone who travels on the tube without water and some back up food for example is not thinking it through.I guess it depends where you are and what you do.
If you work in an inner city office in London then the chances of you needing one are significantly less than someone who works the Forests in Scotland.
If owning one makes you happy then go for it. Always better to have one and not need it, than to need it and not have one.
One of the big revelations for me was carrying a little angle-headed torch. I have used it so much and I always had a torch however the angle head hooked into a pocket is such a clever idea (thanks youtuber who's name I cannot remember for the idea).
Carrying a battery bank and cable is also very useful. I think one of murphy's laws for modern life is that the more important the call, the less battery life you will have.