In all seriousness, Warlocks are the "magical" class of the three, shouldn't they know how to disappear? I think it would be a priority of the order to learn the secrets of the Hunters cloak ability. On another note, I like all three classes, so don't assume anything regarding "master-class".
Note:
This post is geared more towards discussion on a situation that should/should not happen in the reality of the guardians (not in-game). Though, if we were to be talking about in-game, I think it's fair to say Warlocks will not have cloak on an existing sub-class, but on a future sub-class.
[spoiler]master-class trolls are pouring in. :P[/spoiler]
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Yeah I mean warlocks aren't overpowered already let's make them stronger