I think the problems they solve are hearsay.
I'm not sure if your being obtuse for a reason or you simply don't know. There is a correct sequence of disassembly for starters. Some punches work better than others (beveled edges) as opposed to using flat steel punches. I have also seen people use the wrong size and/or just pound them out.
I considered KNS pins - seems like you see a lot of rifles in the various AR threads/forums with them. Then I did some research and it seems most favored the "not really necessary" argument, while some fell into the "probably not needed but cheap insurance" argument. Very few seemed to fall into the "must have" camp, which was odd considering how many picture threads have rifles with anti rotate pins in them. There may be a "taking pictures vs shooting your rifle" metaphor in there somewhere :). Anyway, I installed a Geissele SSA and Geissele advised not to use them, so it became an easy decision :).