I can see wearing the sgian dubh if you're in full highland dress, because to me it's more of a costume piece. I wear it as part of my band uniform or if I'm performing. But if you're wearing a kilt as regular clothing, then I don't see how the sgian dubh is justified. It's not the most useful form of a utility knife that you could carry, and wearing it in the top of the hose is not particularly secure. The historical significance is debatable, unless you're into Victorian re-enactment, I guess. To me, it doesn't help make the kilt a legitimate piece of modern dress to wear it with costume pieces, like dress knives, or big, poofy shirts or glengarries.

It’s a shame you had to destroy a good knife just so you could walk around with a handle sticking out of your sock.

I know there will be a lot of people who will tell me I'm wrong, that they use their sgian dubh all the time, that it’s more than a show piece, that it’s an important part of their heritage, but to me those arguments are specious. I think people just want to have one more thing to wear that makes them special.