i think the point with mini kits is pocketability, yes an sfa would be a nice thing to have, but it doesn't fit into your average pocket.
"survival" is never easy, a mini kit doesn't make it easy, nor does having a knife an axe and a ball of string. if i had a knife and an axe, i'd happily swap either one for my mini kit.
as for real world use, the most useful bits for real emergencies are the sewing kit and the stash of safety pins. typically for clothing repair. the next handiest bit is probably the first aid items.
for playing in the woods use the problem is packing and repacking tiny components in the dark when you're shivering. i prefer bigger more useable components, bigger firesteel with the handle removed and replaced with a special tie-wrap'n'hose loop is better than the tiny ones. a sun brand mini baseplate compass is better than a tiny button compass. single sided stanley knife blades with medical tape handles rather than scalpel blades.
i also keep my kit in a small waterproof otterbox rather than a 'baccy tin.
cheers, and.