Of course you can't, you've become a realist that recognizes the realm of
maximum minimalism. In short order, you reached a stage of personal evolution where the real world is recognized over any ego or fantasy needs. I only know this as a reformed knife nut who in the past spent way way too much good money in search of the next and best knife since the flint blade. I think I grew out of it as I got old. YOu're lucky in that you seem to recognize it while still relatively young. I'm jealous!
There is no reason to every replace your classic, but some days, anticipating the days activities, you may wish to
augment the classic with something a bit larger that can slice a sandwich in half, or deal with light food duty while out and about. With a classic in its leather pouch sheath on the keyring, I sometimes will drop my alox bantam in my pocket. If I'm going to be dealing with breaking down any cardboard boxes, may have my old Chrtisy knife or number 4 or 5 Opinel in my pocket. If I go fishing, my old Buck 102 woodsman is on my hip to handle cutting bait, cleaning what I catch.
But if I'm just kicking about town, I just don't need much knife in urban 21st century life. Forums are full of people that are the obsessed aficionado's that are like car nuts, gun nuts, motorcycle nuts and others obsessed with what ever cult worship object they bow before. My classic opens box's and plastic blister packages as well as any other knife. Maybe a little better with that very thin blade. Maybe my Christy knife is a wee bit better box/package opener as the blade is thin as a box cutter, and locks open in three different lengths. But the 58mm SAK is a perfect fit for urban life in 21st century anywhere. Really, how much skinning of big game do we do, or building shelter from the storm in the mountains? And last I checked, theres no hostile Comanche's coming in to scalp me.
Something my old man told me when I was a kid, and I forgot all about it until a few years ago; remember who you are, where you are, and what you do. I keep that in mind nowadays, and it makes life easier. It reminds me of what I really don't need.
Keep the classic, just augment it as needed.