The fact is, this is just another Ford vs Chevy argument by a bunch of knife nuts/fan boys/object cult worship people. Is there a reason for anything that is mostly personal preference?
Think about this; all you knife nuts on this forum are less than 1% of the population. We're the freaks that non knife people think are nuts. Heck, most people in modern suburban America and most other developed placed don't even carry a knife at all. Yet the sidewalks are not littered with the bodies of those that perished for want of a knife.
Any little bit of sharp steel/bronze/flint will get the job done with a little bit of thought. And the worlds most popular selling knife by both production numbers and international sales is the little Victoriox Classic. Look at most construction sites and the most popular knife you will see is some variant of the old Stanley 99 utility knife with all of a one inch blade. When our water heater took a crap, the plumber unboxed a brand new one from it's double wall cardboard container with a little folding Husky brand utility knife.
Knives are just like cars; people use what gives them pleasure. Most of the world commutes to work in Honda Civics, Toyota Corolla's, and Hyundai Eleantras. They get there with a decent amount of comfort and reliability. But the car nut has to have his Porsche or 'vette, or a Dodge Hemi charger. It makes him happy.
For many years I carried a little Case peanut as my sole pocketknife. No, that's not true, I had a Victorinox classic on my keyring. Somehow I did my job as a machinist, retired and spent a lot more time fishing, camping, and woods walking with my better half of over 40 years. Somehow, we survived. I even managed to cut Karens sandwich inhalf with a knife that wasn't more than half the length of her sandwich's thickness. I just had her turn it over, and I cut through the half from the bottom, then flipped it right side up and slice along the same line from the top. Result was a very large burger sliced neatly in half for her convenience.
I once watched a friend and co-worker field dress a very nice opening day buck with his well worn Buck 303 cadet. He did just fine, as he knew what he was dong.
Carry what you like, and don't try to makeup excuses why you carry it. Going about the normal business of life I don't think many are encountering hostile water melons or cantaloupes or hostile Apaches. A two inch blade is fine for most things you will have to deal with in an urban/suburban environment, and if you are a rancher or farmer then carry what you need for your job. Or carry what you personally like. I personally like to save pocket space so I carry a small pocket knife in the coin pocket of my jeans. A Buck cadet, Victorinox executive, Boker 240 pean knife, Buck 309 companion. With wallet, cell phone, keys, Fenix flashlight, and small handgun, my pockets are getting a bit loaded, so saving a bit of space is a good thing for me. I find in my life as a retired gentleman of leisure that does a lot of fishing, a small pocket knife gets me by.
I think for me the big turning point was at Mesa Verde National Park in 1997. A park ranger was giving a lecture and demonstration in primitive technologies, and he had a rear haunch of a road killed deer. He had a large flint chunk and he used a stick to strike a flat of it off. It was a slender finger length flake of flint. He then proceeded to skin the haunch of deer or antelope whatever it was, and the hide just peeled back. Then he sliced the meat into thin slices for drying. He used that flint flake in an over lapping feathery stroking and it made fast work of that raw meat like a very sharp knife would do. That little finger size flint did the job of a regular hunting knife.
It's all needs vs wants. Knife nuts, car nuts, gun nuts, all get more than they need because they want it. That's okay, just don't confuse the two.
BEGONE, WARLOCK! 
