I've carried at least one of some sort of knife or multitool most every day of my life, starting with a Boy Scout jack knife. In the army, I carried a Buck 110 or Buck Lite with a Leatherman or the dreadful blood blister creating Gerbers the army was issuing in the 80s and 90s. When I was an apprentice Elevator Constructor, I carried the same combo, I used to get a lot of grief from the moronic gestapo union reps because apprentices weren't allowed to carry tools by their beloved standard agreement. They were very familiar with what tools looked like and were quick to pick up on them, as they saw a tool in the mirror every morning as they brushed their tooth and slicked their hair back while smoking their second joint of the day...
For many years I've carried one of the Milwaukee utility knives with the extra blades in the handle and feel naked without one, to the point where if I fly and can't take a knife my first stop is Home Depot to buy one, and will gift it to someone when I'm about to leave. I've worn those things out and have given dozens of them as gifts. I've added a Southern Grind Jackal Pup to my EDC, blade slightly under 3", stays sharp and harder than woodpecker lips. My wife and I also have small key chain folders that take exacto knife blades we bought from a local company here in communist held Colorado that have been through TSA many times without comment, probably because they've never been recognized as knives. They are spendy but pretty slick, I don't remember the name of the company but will try and get a picture out later.
I've owned but never really habitually carried a SAN, I never found a combo I really liked and they could be a little bulky and fragile to carry when I only ever used the blade. I never really found them useful with a blade, so maybe they would have their place without one, but probably not with me. The only use I've ever found for the corkscrew on those things is when I've gotten them as gifts I, or the giver, can point it out and say 'look, it's even got a corkscrew!', which almost always resulted in a smile or nod of approval.