Originally Posted by
Vortling
Because nearly all of the Soulknife's class abilities can be duplicated by an appropriate level magic weapon. Yes, you'll never be without your weapon but unless your DM puts you in the "captured in prison without weapons" scenario a lot or gives you no WBL at all it's not worth it. If you're worried about being weaponless at some point you can probably spare the feat for improved unarmed strike.