I think this is an issue of not being inventive with djinn and always using it for deep infiltration of enemy lines.
Context:
Djinn allows you to move units across extremely long distances.
So why do we not see:
Rapid transport to the front in the form of a Djinn? It can bring heavy units to the front much quicker. Gives much-needed reinforcement in heavy battles.
Evacuating VIU away from the front line? You plop Djinn near cons, open up a portal and bring back that 1000HP grizzly for immediate repair.
Redeployment around the front line? Need to move from one spot to force a breakthrough? Have Djinn teleport the bulk of an army to other part of the front.
I picked these three specifically because adding cloak does not help much - Djinn should never be in the firing lines anyway.
Cloak would make Djinn do one job - infiltration, when we have not used it in innovative ways first.
I say let's try to find a use for Djinn, and only if we find nothing but infiltration then give djinn the cloak.
As an aside, infiltration of enemy lines probably should remain risky and costly. Djinn is one of the few units able to teleport anything from a glaive to an 8K metal army into the opponent's heartland and do so completely undetected.