After reading all the 'well thought out' posts here in your thread, I'll try to (remember) and answer your original question about knife usage and carry...
Yes, most of here are knuts, and have more than one around at all times...I thought I was pretty conservative at first when I read your initial post, then it hit me...if I count the SAK, the wallet knife, the truck knife, the desk drawer knife, and the 'Wave' multi-tool knife...along with my carry two folders, I have lots of knives around me...but that wasn't your question, now was it?
So, in answer to your question...yes, you could get by with only one (

) if you sharpened it regularly...
I usually carry a Leek, Cuda EDC, or Vapor...all in 50/50, all sharp. Today, an average day, I cut through the insulation on some pretty heavy insulated cable with my EDC to get the wires out...I needed them.
The down pressure I applied was so hard that I cut the metal braid under the rubber too. A coworker was shocked that I would 'do that' to my knife...Christ, I might dull it even...lol
WTF? I keep big stones laying around here at 'Casa de Mel', and while making my evening meal, I sharpened it again...for about the 100th time. A few strokes here, a few strokes there, and I'm ready to cut cable again tomorrow...
(Doesn't everyone do this? Take a poop, sharpen a knife...talk on the phone, sharpen a knife...have a smoke, sharpen a knife...right?)
Keep it sharp...if you carry two, keep them both sharp...ad nauseum
Mel