We don't know if this is true. For all intents and purposes, the dark urge may have different ending options than Tav.
... I personally also am not fond of Harm OCD Simulation Mode. Not to an extend I want it in every playthrough.
Relevant examples
-- Vision: good alignment in iron man mode.
It can happen that you botch a roll, but the additional threat of the Dark Urge may be overkill.
-- Vision: a set, pro social backstory
Yeah, nope. No. Not happening.
-- The plothole: when -- between your past and losing your memory -- did you become a devotion paladin? Why do you remember your oath?!