Hi Mikel_24,
for sure something like kindex is less delicate than a wooden saya. I just don't like kindex for kitchen knives.
I made my first saya for my wife, to save her fingers from the sharp edge (I'm pretty good in sharpening) and to save the edge from her uncare...
I use the security pin just in case i need transport the knives, usually they are in the drawer and I can take a knife with a hand and unsheat it with the same hand in a movement using the thumb. Sure you have to regulate the friction on the blade in the making, for this reason my sheat are calibrate on the blade.
Sure natural wood is delicate, but with little care using natural oil and wax, your sheat will be awesome for many years...
Standard sheat made in stock are not so comfortable like this, I saw some and I moved to build my own...
Best regards
P.