"Dire need for an errata?" No, not really.
But with the inclusion of the Rapid Draw Adept Power (pg 173, Street Grimoire) it does open up the area of a "properly holstered" weapon.
While it appears to be generally hand waved that any weapon can be properly holstered for free... A Thrown Weapon Adept would be interested in getting the concealed and / or quick draw options. And it gets worse when you expand from the shuriken / throwing knife arena into grenades, javelins, throwing syringes, mono-bolas, etc....