Honestly, I have no idea why they didn't leave the regular knives alone, and make the incendiary knife have an impact penalty. Knives as a whole really aren't the issue, just the incendiary version. Even at that, I'm not certain why we are removing the consequence of making the life choice to have no armor. With tripmines, fire knives, and fire bolts all being cut down to size, does armor even factor in to pub play anymore, really? It's generally 10% or less of a health increase.