I do have a beef with this too. I bought a perk called throwing knives and... there are no “throwing” knives! You throw your regular knife and you can’t pick it up again. You lose the knife.
Throwing rare quality knives you create yourself (they're cheap to make) does a holy shitton of damage if your appropriate stealth levels are high.
I should be able to input a number of knives I want to craft, hit the craft button, and boom, I have 20 knives.