You are certainly right about Vic SAKs being used as work knives. I once read about an African safari company that issued two knives to its porters, a 12 inch machete and a Tinker, and I suppose there are any number of people in the world who do actual work daily with their SAKs. But the fact is that typically, most of them are seldom if ever used at all. SAKs are a great pocket item, often carried but seldom used. My wife has one in her purse that gets used maybe once or twice a year these days. Most people I know who have them use their's only occasionally, and often as not, it's the screwdrivers, corkscrew, bottle openers etc. that get the most workout. For years, my only EDC pocket knife was a Swisschamp, used almost daily, not as a heavy duty tool but for convenience. Vic SAKs are well designed and made for the way they are usually employed, but if you were cutting down cardboard, linoleum or vegetation all day long, you would have to do a lot more resharpening than if it were a dedicated folder, say, with a blade made of VG-10 or some other better edge holding steel, and chances are, the SAK would show some significant wear over time. My EDC these days includes a Delica or similar because they are more robust, easily deployed and simply better cutters.
That said, I would not consider myself underknifed with a SAK. Back when it was my only, the neighborhood kids called me "Knifeguy," and every so often I had to show off the implements to a group of fascinated youngsters. Call me "Johnny SAKseed."
