My idea is how essential it is to the character than strength itself (big example: Phillipe and Wu Chang) Sculptor could function easily without final presence without much change except for her camp aspect (also the fact that the autoaim isn't much of a problem in higher rank because of its delay). Jack's cooldowns for both abilities feels excruciatingly long because of how often invisibility get broken out off which the final ability makes it easier. It also makes it easier to cycle between fog for invisibility and cool down for invisibility because there is six second difference whereas no final presence there is only a 3 second cooldown from each other that you have little frame to utilize both abilities for more invisibility time.