Like how back before forsaken Alot of people would avoid fully upgrading the golden gun subclass so they could have 3 shots and more time instead of 6 shot with short time...
My point is will it be possible to completely avoid using and interacting with the darkness...
Lore wise it makes perfect sense to have a choice but gameplay wise I think your going to force us the use them even if I completely avoid unlocking them next dlc it will be forced into my inventory fully upgraded...
Let us choose and have an up side and down side to are character choices.
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You will be forced to unlock the subclasses during the campaign, but after you unlock them there is no requirement for you to use it unless a quest/bounty/objective calls for stasis kills or freezing enemies or something along those lines.