The Nightstalker subclass was originally going to get the perk named "Well provisioned" , this perk would grant the class a second grenade and increased duration. This perk has been replaced by one called "Lock down": Grenade and smoke effects last twice as long, allowing strong territory control.
-Yes this perk is good in the sense that it will grant crowd control
-Yes it's good they included smoke
However, the previous perk was more beneficial and finally gave the hunter the ability to have two grenades just like every other class can have. It was fair. Now the hunters are getting the short end of the stick again when it comes to double grenades. Bungie please return that perk, hunters deserve double grenades as well.
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Hunters have the blink/quickdraw combo with no other class has & have chain of woe which significantly increases stability for weapons upon landing precision shots which again no other class has, nighstalker can not only go invisible with a grenade but has the shadestep ability which let's you dash in any direction while reducing damage intake(no other class could even fathom this). Hunters do not need any additional things in any of their subclasses