For about 20 years a Vic classic was on my keyring, and it got used for a heck of a lottos cutting, snipping, screwing, and even bottle opening now and then.
In the 50 years since I got my first SAK, there has been one on or close to me, no matter what other knife was with me. I carried a Buck stockman for time, then a Case peanut for a while, but the SAK was my constant. Like the pole star, it was constant companion, EDC tool, emergency resource. Many times it was my sole EDC. When I was to fly someplace on vacation, I would mail a recruit to myself where I would be staying.
Only in my 'later' life have I almost I gone sole EDC SAK. There are a few 'other' pocket knives in my sock drawer, but they very rarely get carried anymore. I guess I have always been very aware that a knife, a real dedicated knife, is just a one trick pony. All it does is cut. Too many times I've had to fix something out in the middle of nowhere, and a SAK was in my pocket. A small bundle of tools lets you fix things like faulty motorcycles, a trolling motor on a canoe at the far end of a large lake, a fishing reel out on the flats in the Florida Keys.
I finally got tired of lugging around a bunch of knives so I just went sole SAK. It makes life easier. I haven't run into anything that a SAK wouldn't cut that a Buck stockman, Boker Barlow, or any other knife would do better. And the SAK has tools. And that's what makes the difference.