He lists very good reasons for carrying that way, but I say why limit yourself to one side or the other?
I carry two Spyderco Delicas, one clipped inside of each front pants pocket. They are set up in the same way, tip-up carry, clip on the same side. Not sure how to describe which side and orientation the clip has, so here’s a picture:
Of course, the only picture I have doesn’t show the clips but…they are on the other side of the body, with the clip fastened to the bottom end…. so when closed, the blade tip and clip “screws” meet. Allows tip-up carry. You can figure it out. 🙂
And then, one into each pocket.
What this allows is access to a blade by either hand, either side. And to work the knife is consistent for each hand. So if the right hand gets the knife on the right side, it’s a simple motion to open the knife. If the right hand reaches for the left knife, the orientation remains the same and opens the same. The left hand only requires a small rotation of the knife in the hand, but it’s the same rotation regardless of knife.
This way, I have no limits. Any hand, any side, any blade.
For those that carry only one knife on one side (either side), what if you can’t get to that side when you need your knife? What will you do?
You can also argue the “2 is 1, 1 is none” angle. Of course, I have 3 if you count the Leatherman.
To me, these are useful everyday tools. Heck, I used my Leatherman Wave’s wire cutters a few days ago to trim a couple stray branches off our barbados cherry bushes where they were overhanging into the sidewalk. I use the Delica’s every day for things like opening letters. I know some say if it’s a knife for fighting you shouldn’t use it, keep it clean, sharp, ready. I say, I can clean and sharpen my knife, and every time I take the knife out to use it to open a letter that’s another repetition at drawing and opening to keep me in practice.
To carry two comes from Insights Training Center and their Defensive Folding Knife class.