Ok so say hunter gets a insta-kill melee.
Titan gets one ( yes i know he/she has one already)
Warlock doesn't have one...
But wait theres more.
The THROWING knife is a projectile.
Titan has to get their insta kill weapon a projectile mode.
Warlock needs one too now.
Do you get my point?
It would become very unbalanced.
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you havent mentioned the most important part about throwing knife....... [spoiler]there is a perk that lets you use two in a row,and it stacks with fire knife 2 *instakills* pretty much XD[/spoiler]