Interesting Q, Brian.
You predictably got flamed by the bushcrafters, etc. Even as some acknowledged never actually needing a knife.
For 30 years, on the job site, I always reach for the scissors and not the razor knife if I possibly can. I get kind of preachy about that with underlings as it greatly reduces trips to the ER (and therefore OSHA recordable incidents). So I have a nice selection of substantial shop shears and scissors in my garage and in my field tool box.
Vastly easier and safer with scissors:
cutting mole skin, Second-Skin, bandaids.
opening plastic food packaging.
trimming fabric or thread during field repairs.
trimming finger / toenails.
cleaning a razor clam.
Vastly easier with a blade:
splitting kindling, shaving tinder.
cutting salami / cheese.
filleting a fish. (but how many halibut or king salmon do any but me catch? Don't you cook a 10" rainbow whole?)
Spreading peanut butter. Although a spork or spork handle works better and is easier (and SAFER!) to lick clean.
Fabricating objects from wood - tent poles, replacement button, pack stay, Huck-Finn raft, etc.
I have rarely made a blade from chert or obsidian. I have never fabricated scissors on the trail. More usefully, I have often used a found stone as a file or sand paper to shape, smooth or thin a piece of wood or metal.
*IF* I was limited to one or the other and I don't use a wood stove, I think I would go with the scissors. But since a SAK Classic is 21 grams / 0.75 ounces and has scissors, blade, tweezers, and nail file, for me, that's the easy answer. The Classic also gives you a decent-sized handle for using the scissors and blade.
But I still go for the scissors if at all possible. Who among us has NOT cut themselves with a knife? Who HAS cut themselves badly with scissors? A sliced finger is bad enough in town. It could really suck 4 days out on the trail or a week into a remote rafting trip.