Its not, all classes should be able to pull the numbers required to get through, but a ninja has to WEAVE through all the traffic in Clip city, so if they make a wrong turn and/or die.... they already are weak in terms of usefullness rn, will be even worse if they die or fudge the rotation.
DNC honestly seems to do well (tho i often think they need a small buff somehow, make procs happen a little more often for instance)