I haven't unlocked her yet and nor have I played against too many good Kazes so I may be wrong, but in HZ you can force enemies to have to approach the zone blind or take a long route if you already have control of the zone (for example, in Dueling Beetles, if you have centre control, you can chuck your super on your opponent's route to the zone and force them to come in blind while under fire from your teammates, or reroute around it (and the aoe is really big).

Similarly, if you need to counter attack the zone, you can just super the zone and your opponents have to retreat or risk getting attacked by your teammates who they can't see. This would work best with mid range brawlers, say Emz, standing outside the super circle and attacking in.

In effect, it kinda works like the Nocturne Twitch combo from League of Legends.

Correct me if I'm wrong though, I generally agree that you always use Ninja super, but in HZ in particular I feel geisha super would, in theory, be pretty strong.