In the lore of Destiny it appears that warlocks are the main class that have blink and also says that some hunter ( bladedancers) have learned blink from warlocks.
So why does only the voidwalker have blink? Stormcaller needs blink too I think
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Because the inevitable tears that a jump was copy and pasted into the new subclass would be enough to usher in a new era in which we are subservient to the dolphin and merpeople who now reign over our submerged society?