Ofc Shuriken-Combo will results in high boss dmg on Harjatan and Misstress. But in those cases other specs do 3 times the dmg on the adds which have to die as well.
And nobody gives a shit about being stacked for utility. We did not pick rogue as a main because we dreamt of being the soak bitch in the raid. Its silly to put this "utility" on a scale with dmg.