The Dagger of Darts damage bonus doesn't change pet dmg

In this build, it doesn't show any change for the dart shooting fetishes, or whatever else may shoot darts. Only thing where it changes the dmg out put is the fetishes dmg output under primary skill poison darts and only if you're using Carnevil.
In the game Dagger of Darts clearly makes all dart shooters pierce enemies and do more damage, besides your own primary attack.