Couple issues :
1. As to tying down builds, I never said that the Barbarian shouldn't be able to carry knife weapons, just that differences between two handed weapons (reach and non-reach) as opposed to small weapons should be larger -- especially with the carnage effect.
1. As to the game already having magic and that you can do damage hitting enemies with a Grimore; even though lore and games have magic does not mean they don't strive for a degree of consistency, especially for elements that are not meant to be magical. The stilettos aspect is not suppose to be magical.
2. Difficulty
I am playing on hard and POTD
3. gkathellar : "As per point (a) above, heavy, thick-bladed daggers are one of the most effective tools for armor penetration at extremely close range."
Stilettos are not thick bladed short swords, nor is this historically accurate. As per history, the response to plate was not a mass of short swords, but heavy crushing weapons and lances (estocs).
None of these responses address why a smaller carnage range for small weapons would not be appropriate. That a battle axe (apparently not a reach weapon) should not have wider reaching carnage than a stiletto.