The cable-tang process is actually more expensive than a standard full tang (or a push tang).
The cable makes the handle lighter, giving the blade more weight - actually making it a little more lively in the hand and adjusting the balance point.
It also distributes shock through the handle. This is particularly useful as the Natchez handle material is hard - It's easier on your hands as well as the handle material.
These design choices were made to make the Natchez a faster, more lively and more effective fighting knife.
It's a specialized tool.
However, as I said before, I've seen the Natchez take some tremendous abuse - we actually shot our new Proof videos a few weeks ago and I saw that knife go through hell.
We test everything to breaking point and that cable tang just didn't break. I have every confidence in it's durability.
CAN it be broken? For sure. I'm pretty sure anyone can eventually break anything

I just haven't seen it happen...